Related
Edit: This was done on a Venue 8 7840.
As mentioned, I ran the OTA like an idiot forgetting I was still rooted and of course, bootloop. I am stuck on the Intel Inside screen, with the developer flash tool it will show the device is connected but it comes and goes so I am not sure what I can do, if anything, to revert to stock or do anything. Does anybody have any suggestions or am I SOL? Any help is greatly appreciated. Thanks in advance! :crying:
Try using the Phone Flash Tool utility provided in the developer edition files, and follow the process used to flash the developer edition firmware, but instead flash this unbrick.zip:
https://mega.co.nz/#!Vgw1CTYT!y1_tSTCMmzrhJSQy0lxwY59iyRhdJovC-IDMF25PB4k
Let me know how that goes for you.
EDIT:
For the flashing process, try with the tablet completely off and disconnected, then load the unbrick.zip file in Phone Flash Tool, then click the "Start to flash" button (the one near the bottom should be blue/clickable), then once it starts counting (attempt #0, attempt #1, etc.) then plug in the USB to the tablet. It should then flash the firmware pieces.
xBIGREDDx said:
Try using the Phone Flash Tool utility provided in the developer edition files, and follow the process used to flash the developer edition firmware, but instead flash this unbrick.zip:
https://mega.co.nz/#!Vgw1CTYT!y1_tSTCMmzrhJSQy0lxwY59iyRhdJovC-IDMF25PB4k
Let me know how that goes for you.
EDIT:
For the flashing process, try with the tablet completely off and disconnected, then load the unbrick.zip file in Phone Flash Tool, then click the "Start to flash" button (the one near the bottom should be blue/clickable), then once it starts counting (attempt #0, attempt #1, etc.) then plug in the USB to the tablet. It should then flash the firmware pieces.
Click to expand...
Click to collapse
Thank you very much for the reply! I'm going to give it a shot now will report back shortly
First off, thank you for the reply, I flashed the unbrick.zip and it flashed successfully. Now the device is just showing a USB symbol with a filled progress bar under it and does not do anything else, still not able to get into bootloader or anything. Any ideas?
xBIGREDDx said:
Try using the Phone Flash Tool utility provided in the developer edition files, and follow the process used to flash the developer edition firmware, but instead flash this unbrick.zip:
https://mega.co.nz/#!Vgw1CTYT!y1_tSTCMmzrhJSQy0lxwY59iyRhdJovC-IDMF25PB4k
Let me know how that goes for you.
EDIT:
For the flashing process, try with the tablet completely off and disconnected, then load the unbrick.zip file in Phone Flash Tool, then click the "Start to flash" button (the one near the bottom should be blue/clickable), then once it starts counting (attempt #0, attempt #1, etc.) then plug in the USB to the tablet. It should then flash the firmware pieces.
Click to expand...
Click to collapse
I thought I'd move over to this thread to keep it all together.
If I let the tablet boot normally, I get the following output: http://pastebin.com/zfsPRdC5 and the flash fails.
If I boot the tablet with power + volup, the flash is successful and I get http://pastebin.com/kQg8vwLC but I'm still on the USB screen.
If I flash the Dell Opensource IFWI + DNX (booted with power+volup) from the opensource package, it goes back to bootlooping with the intel logo.
Quick update, I don't have any further things to try at the moment, but I see that for past tablets Dell has released droidboot OS image which lets you recover a bricked device, so I've emailed support to see if they'll release it for this one. I'll post back once I hear something.
xBIGREDDx said:
Quick update, I don't have any further things to try at the moment, but I see that for past tablets Dell has released droidboot OS image which lets you recover a bricked device, so I've emailed support to see if they'll release it for this one. I'll post back once I hear something.
Click to expand...
Click to collapse
Thank you for all your help, I am not very familiar with Dell tablet devices so getting started was fine, rooted and all. Thank I had to go and flash the update without removing SuperSU like an idiot, LOL. Usually on any device I do this just in case, even if it *says* it's not necessary. Anyways, I look forward to hearing what they have to say, I figured I was stuck with a dead tablet, which I suppose could still be the case. Of course, still getting the USB logo when I try power. Thanks again @xBIGREDDx you're the man. :silly:
xBIGREDDx said:
Quick update, I don't have any further things to try at the moment, but I see that for past tablets Dell has released droidboot OS image which lets you recover a bricked device, so I've emailed support to see if they'll release it for this one. I'll post back once I hear something.
Click to expand...
Click to collapse
Any word back from Dell support? Or is it looking like this is a lost cause and I should just trash this thing I tried to get a hold of them myself but it is damn near impossible.
xploitnt said:
Any word back from Dell support? Or is it looking like this is a lost cause and I should just trash this thing I tried to get a hold of them myself but it is damn near impossible.
Click to expand...
Click to collapse
Nothing yet; I'd give them another week or two... they do take quite a while sometimes with these things.
xBIGREDDx said:
Nothing yet; I'd give them another week or two... they do take quite a while sometimes with these things.
Click to expand...
Click to collapse
If all else fails just request and RMA and send it in for a replacement. I've always had great support from them on their business side. We usually get their accidental damage coverage on our work machines that replaces them for any reason. I have my 7840 through our work account and I have also rooted it but I have no doubt that I could send it back to them for a replacement if I brick it.
any new infos?
Hy ,
Are there any new infos about this problem?
I have the same problem with stuck at the usb logo.
No fastboot, no adb. I flashed many ifwi, dnx combinations but i get black screen or usb logo.
If you could repair your device, i would like no know please.
thx
i don't think my experience helps but i will post it anyway. When i turned on my tablet on today, it somehow started the upgrading process by itself when i try to open the play store. I thought i would brick the device since i rooted my tablet already, but i somehow made it. I lost root, but i was able to keep my data intact.
UPDATE:
Dell has posted a "blankphone" zip on their open source site. This will re-format your device and it does not contain a system image, but it should re-configure your partitions and flash a functioning fastboot image. There has been one report of this somehow fully fixing a system (I suspect the OTA was still sitting in a cache somewhere). Also based on the filenames in the zip, I think this might contain unlocked firmware. Either way, if we can get a system.img into a flashable state, you should be good to go.
Also they finally renamed the folder to "Moorefield" instead of "Merrifield"
"IntelAndroid-FBRL-07-24-2015" will cure the bootloop?
i flashed xposed to my 7840 lollipop and bootlooping.
i flashed it with "IntelAndroid-FBRL-07-24-2015".
u can find this in other device forum.
so, i flashed uninstaller of xposed, then 7840 is escaped from bootloop.
btw can anyone flash the appropriate xposed for 7840 lollipop with this tool?
hope 5.1.1 custom rom can be flashed...
Did Dell ever respond or has anyone else found a solution? I was ready to buy a 7840 but the apparent lack of support from Dell and minimal third party development has me seriously considering an Nvidia Shield, despite its inferior display and design. They're the same price and appear to be pretty evenly matched in all respects except 3D performance.
Any input that would help me with that decision would be appreciated.
So, for Christmas my daughter's mom got her an A33 Q88H QuadCore Softwinner tablet, and we discovered the OS it came with had some very strange issues related to a lack of compatibility with Google Play, so I tried to get around that with software, but I needed to be rooted. However, I had bizarre difficulties with SuperSU, unlocking the bootloader, rooting, and even more difficulties trying to flash a custom recovery that I could use to ROOT-- the obscure china tablet had no TWRP or CWM support. I finally tried a very convoluted method of flashing what appeared to be a ROM for the A33 Allwinner tablet, which hadTWRP already installed, so I could use TWRP to root it, and then finally fix the software issues.
However, the process didn't work, and when I rebooted the phone, I found it stuck on a black screen with a tiny android symbol, and that's how it's been since. Holding volume and power button only reboots it to the same screen -- no bootloader or anything, so I can't find any way to try to flash a factory ROM to get it back to regular settings. When I plug it into my computer, it makes the input noise, and shows up in Device Manager as "Android Device" with "Android ADB Interface" drivers successfully installed, but ADB doesn't recognize it as a device, and I can't get it into any sort of download mode -- it isn't recognized in My Computer as a hard drive. So, I can't find a way to interface with the tablet to reflash a stock ROM. :frown:
It's her Christmas present, so I don't want to admit that I've broken it; I've been trying to solve it all night for 12 hours straight, but I just can't find anything that works! Is there any way you guys can help me? :crying:
I tried to attach some pics but the uploader isnt working.
bump
So I admit I am an idiot and did this to myself. I installed the latest FireOS OTA through TWRP then thought to keep TWRP I would install it before I rebooted. I know I probably should have read threads about keeping root and the horribleness of 5.6.0.1 but I did not. So I can boot into the OS and I can boot to bootloader but I have no recovery at all. Any one know how to recover from this? Found out the unbrick method I have used before does not work. Fastboot give me an error about locked hw.
Been working on this anyone know or have a fastboot zip or image. I am getting a errors trying to flash the amazon bin with fastboot.
I know I am the only one posting here. I read through a bunch of threads that seem to be people in the same issue. I have now managed to get it stuck in demo mode. I also cannot seem to accomplish much from fastboot because I get a locked hw error. Bought a couple for parts HD6s off ebay. So hopefully I can make something work and get at least one working tablet. This has really put a damper on trying to create a device tree to try and build cm12.
Closer to being a brick. Some how I managed to have root in adb and managed to wipe all. Which I guess really meant all. Now all I get is the amazon logo. No desktop. No adb. No way to get to fastboot.
So ebay tablets came in, bout a lot that had 2. The one was listed as a demo model, so a simple ;demo in the search and resell the device and viola fully working tablet. It still had 4.1.1 on it so a simple update to 4.5.3, Kingroot, and TWRP install and back on CM11. The second was "black screen" so I assumed bricked as it did not seem to turn on when plugged in, initially. Tried running through unbrick but nothing from ./reader.sh so assumed on newer FireOS that blocked that function. After setting the first up I was rearranging my stack on now 2, what I thought where, badly bricked devices. Hit the power button and booted to lock screen with 7% battery. So I now have an extra HD6 to mess with. Best part is I got both of them for $20 total.
Hi hello
So here’s a head scratcher I hope someone can help me with that won’t involve replacing my main board.
Got myself the p20 lite (ANE-LX1 C432) - Single Sim.
I unlocked the bootloader with Huawei just before they stopped handing out the codes. All was good and happy with the world.
Rooted with Magisk and Was busy messing around With Termux, Linux deploy, Mobile Terminal and some pretty basic stuff. I’ve been out of the android scene for a while so was getting reacquainted with the scene.
Anyway. I was messing around in the terminal in a root shell just fixing basic permissions after messing up my termux environment as root. Phone randomly rebooted (I must’ve messed with the wrong folder -no idea which) came back on and my IMEI and baseband were gone.
No worries, I thought. Happened tonnes of times with my previous Devices (looking at you Samsung) just a quick restore or flash and all will be happy again.
Yeah, not quite.
Note that up until this point I hadn’t touched the system partition (probably besides the mobile terminal mishap -no idea)
So over the last week or so I have tried everything. Restore from Twrp backup. Flashed stock through fastboot, through erecovery. Those flashed ok but didn’t fix it.
Putting numerous different update.app FULL & OTA updates in dload folder on SD and internal all failed. Only used my builds version of course and only ones firmware finder deemed compatible/available
Then I got desperate (read: stupid) Decided to take the unpacked firmware files and flash whichever ones twrp would let me. First tried just the modem files. Didn’t help. Then just went through the list and flashed all I could.
I think the kicker came in when I installed the Trustfirmware.img because once I did that I rebooted and now I was stuck in an endless boot loop. No way to get into recovery. Not with their ton combo nor adb/fastboot.
I still had access to fastboot at this point at least and started doing every single thing suggested all over the net just trying to get back to stock.
Tried the unbrick option on The Huawei Multi-Tool. Flashed ok. Phone still wouldn’t boot. Did it a few times with 3 approved versions. Nothing. Only access to fastboot otherwise I was in a boot loop with error mode error no 15 and the verification failure (Attached below)
Last thing I tried after reading online was to relock my boot loader and flash stock. So I locked it with Huawei Multi-Tool. Reboot......
Now I don’t even have access to fastboot. My PC’s (windows and Linux) don’t even acknowledge it and holding volume down in all the weird and wonderful ways and times does nothing. All I get is startup Huawei Logo, Error Mode as per pic Below and then reboot. That’s it.
I’m assuming it’s trying to do a factory reset after relocking the bootloader (if it even locked properly, can’t check) but it can’t get into recovery/erecovery. I dunno ?
That’s my essay of where I’m at. Warranty is already void so not an option and I don’t want to buy a new mainboard (may as well buy a new phone).
So here I am. Is this my life now or does anyone have any magic tricks to possibly suggest?
Pyrolectic13 said:
Hi hello
So here’s a head scratcher I hope someone can help me with that won’t involve replacing my main board.
Got myself the p20 lite (ANE-LX1 C432) - Single Sim.
I unlocked the bootloader with Huawei just before they stopped handing out the codes. All was good and happy with the world.
Rooted with Magisk and Was busy messing around With Termux, Linux deploy, Mobile Terminal and some pretty basic stuff. I’ve been out of the android scene for a while so was getting reacquainted with the scene.
Anyway. I was messing around in the terminal in a root shell just fixing basic permissions after messing up my termux environment as root. Phone randomly rebooted (I must’ve messed with the wrong folder -no idea which) came back on and my IMEI and baseband were gone.
No worries, I thought. Happened tonnes of times with my previous Devices (looking at you Samsung) just a quick restore or flash and all will be happy again.
Yeah, not quite.
Note that up until this point I hadn’t touched the system partition (probably besides the mobile terminal mishap -no idea)
So over the last week or so I have tried everything. Restore from Twrp backup. Flashed stock through fastboot, through erecovery. Those flashed ok but didn’t fix it.
Putting numerous different update.app FULL & OTA updates in dload folder on SD and internal all failed. Only used my builds version of course and only ones firmware finder deemed compatible/available
Then I got desperate (read: stupid) Decided to take the unpacked firmware files and flash whichever ones twrp would let me. First tried just the modem files. Didn’t help. Then just went through the list and flashed all I could.
I think the kicker came in when I installed the Trustfirmware.img because once I did that I rebooted and now I was stuck in an endless boot loop. No way to get into recovery. Not with their ton combo nor adb/fastboot.
I still had access to fastboot at this point at least and started doing every single thing suggested all over the net just trying to get back to stock.
Tried the unbrick option on The Huawei Multi-Tool. Flashed ok. Phone still wouldn’t boot. Did it a few times with 3 approved versions. Nothing. Only access to fastboot otherwise I was in a boot loop with error mode error no 15 and the verification failure (Attached below)
Last thing I tried after reading online was to relock my boot loader and flash stock. So I locked it with Huawei Multi-Tool. Reboot......
Now I don’t even have access to fastboot. My PC’s (windows and Linux) don’t even acknowledge it and holding volume down in all the weird and wonderful ways and times does nothing. All I get is startup Huawei Logo, Error Mode as per pic Below and then reboot. That’s it.
I’m assuming it’s trying to do a factory reset after relocking the bootloader (if it even locked properly, can’t check) but it can’t get into recovery/erecovery. I dunno ?
That’s my essay of where I’m at. Warranty is already void so not an option and I don’t want to buy a new mainboard (may as well buy a new phone).
So here I am. Is this my life now or does anyone have any magic tricks to possibly suggest?
Click to expand...
Click to collapse
Check the second post in this thread:
https://forum.xda-developers.com/honor-7x/help/help-stuck-error-mode-screen-t3735067
kilroystyx said:
Check the second post in this thread:
https://forum.xda-developers.com/honor-7x/help/help-stuck-error-mode-screen-t3735067
Click to expand...
Click to collapse
Thanks for this.
The battery discharged fully about two days ago.
I haven’t tried plugging it in and out as/if it turns on immediately (though even though it shows dead without charger it still comes on immediately).
I’m gonna get a weaker lower amp charger and see if that maybe helps. Fml ?
***UPDATE***
Been at it for hours. Battery is completely flat. But h second I plug it in the the Black Huawei logo comes up ten a few seconds later it’s on the same error screen for a little longer then boot loops like that constantly.
The error isn’t the same as the post in that link though. And I am FRP unlocked.
Eh.
Pyrolectic13 said:
Thanks for this.
The battery discharged fully about two days ago.
I haven’t tried plugging it in and out as/if it turns on immediately (though even though it shows dead without charger it still comes on immediately).
I’m gonna get a weaker lower amp charger and see if that maybe helps. Fml ?
***UPDATE***
Been at it for hours. Battery is completely flat. But h second I plug it in the the Black Huawei logo comes up ten a few seconds later it’s on the same error screen for a little longer then boot loops like that constantly.
The error isn’t the same as the post in that link though. And I am FRP unlocked.
Eh.
Click to expand...
Click to collapse
I guess your previous error was related to ramdisk...
Now what is your current situation?
-What error is showed in the Error mode?
-Can you reach FASTBOOT&RESCUE MODE menu?
-What is your current recovery?
kilroystyx said:
I guess your previous error was related to ramdisk...
Now what is your current situation?
-What error is showed in the Error mode?
-Can you reach FASTBOOT&RESCUE MODE menu?
-What is your current recovery?
Click to expand...
Click to collapse
As it stands I cannot enter fastboot or recovery mode. Update from SD also doesn’t do anything. Battery is completely discharged. And if I leave it on the charger it doesn’t charge, only boot loops.
So with all that the ONLY thing this phone does now is:
- Starts up Showing Huawei logo
- Error Mode Screen with Func No: 15 (bl31 image) & Error No: 1 (security verify failed)
- Reboots
Ths happens whether it’s plugged into the pc’s usb or the charger. Tried all combinations of buttons too.
It has stock recovery as I flashed that back when trying to revert back to stock.
I lost access to fastboot after I locked the bootlaoder again using the Huawei Multi Tool. It’s like it trying to do the factory wipe that it usually would after locking/unlocking the bootloader but is unable to due to the error mode screen.
Sent from my iPhone using Tapatalk
Pyrolectic13 said:
As it stands I cannot enter fastboot or recovery mode. Update from SD also doesn’t do anything. Battery is completely discharged. And if I leave it on the charger it doesn’t charge, only boot loops.
So with all that the ONLY thing this phone does now is:
- Starts up Showing Huawei logo
- Error Mode Screen with Func No: 15 (bl31 image) & Error No: 1 (security verify failed)
- Reboots
Ths happens whether it’s plugged into the pc’s usb or the charger. Tried all combinations of buttons too.
It has stock recovery as I flashed that back when trying to revert back to stock.
I lost access to fastboot after I locked the bootlaoder again using the Huawei Multi Tool. It’s like it trying to do the factory wipe that it usually would after locking/unlocking the bootloader but is unable to due to the error mode screen.
Sent from my iPhone using Tapatalk
Click to expand...
Click to collapse
I see, it is really bad
My last hope is to be able to do a forced Firmware upgrade. Press power button and VOL + and VOL- simultaneously. Do you see the same as the attached image?
kilroystyx said:
I see, it is really bad
My last hope is to be able to do a forced Firmware upgrade. Press power button and VOL + and VOL- simultaneously. Do you see the same as the attached image?
Click to expand...
Click to collapse
Ah man, I wish it would even do that. It makes no attempt to even pretend to see the sd card update. If I hold all the buttons in it still only comes up with the error mode and reboots.
I popped it open and connected a charger up battery to see if that would help but it doesn’t.
Do you maybe know the pin layout on the inside or know where I could get schematics? Been looking everywhere.
I’m almost done building my own Jtag box and am hoping to bring it back to life by writing straight to the damn thing.
Sent from my iPhone using Tapatalk
Pyrolectic13 said:
Ah man, I wish it would even do that. It makes no attempt to even pretend to see the sd card update. If I hold all the buttons in it still only comes up with the error mode and reboots.
I popped it open and connected a charger up battery to see if that would help but it doesn’t.
Do you maybe know the pin layout on the inside or know where I could get schematics? Been looking everywhere.
I’m almost done building my own Jtag box and am hoping to bring it back to life by writing straight to the damn thing.
Sent from my iPhone using Tapatalk
Click to expand...
Click to collapse
That is sad!!!
With JTAG and schematics stuff I cannot help you.
What I found recently and it was new for me (I didn't tested yet) is a possibility to install firmware via "dload" folder, but to start installation the stock recovery have to be full functional.
If I found something interesting for you I'll post here.
kilroystyx said:
That is sad!!!
With JTAG and schematics stuff I cannot help you.
What I found recently and it was new for me (I didn't tested yet) is a possibility to install firmware via "dload" folder, but to start installation the stock recovery have to be full functional.
If I found something interesting for you I'll post here.
Click to expand...
Click to collapse
To my knowledge the recovery is installed. Well erecovery. It was working up until I locked the bootloader again and it went into a boot loop instead of doing the factory reset.
Is there any other way to force sd update other than with the dload folder?
Thanks for tying to help, I appreciate it.
Pyrolectic13 said:
To my knowledge the recovery is installed. Well erecovery. It was working up until I locked the bootloader again and it went into a boot loop instead of doing the factory reset.
Is there any other way to force sd update other than with the dload folder?
Thanks for tying to help, I appreciate it.
Click to expand...
Click to collapse
You can check the official documentation about that.
Please let us know how you solved this problem.
kumarsid7 said:
Please let us know how you solved this problem.
Click to expand...
Click to collapse
Still unsolved as of yet.
I’ve finished building my own version of the Riff/Octoplus box as well as a makeshift Jtag. I’m still trying to find and piece together some firmware files and other board software I think I need.
Also, if anyone has any idea where the test point is on this board I’d really appreciate you pointing it out. I cannot find the schematics or any solid documentation anywhere.
I will attach the pics I have of both sides of the board as soon as I get home.
Sent from my iPhone using Tapatalk
in first picture youle see many circles golden 2 smallest is testpoint good luck
Pyrolectic13 said:
Still unsolved as of yet.
I’ve finished building my own version of the Riff/Octoplus box as well as a makeshift Jtag. I’m still trying to find and piece together some firmware files and other board software I think I need.
Also, if anyone has any idea where the test point is on this board I’d really appreciate you pointing it out. I cannot find the schematics or any solid documentation anywhere.
I will attach the pics I have of both sides of the board as soon as I get home.
View attachment 4579956
View attachment 4579957
Sent from my iPhone using Tapatalk
Click to expand...
Click to collapse
in first picture youle see many circles golden 2 smallest is testpoint good luck
well, try to restore your device using dload method. It needs you to copy the UPDATE.APP in dload folder of an external sd card(formated in NTFS format) and then just press both vol up+down along with power button for a few seconds. It will auto launch huawei e-recovery and will try to flash the UPDATE.APP you stored in ext sd card. This should definitely work.
Dload method doesn't need you to unlock your device or bootloader.
Maybe?
I know it’s a long shot but I still have this phone. If anyone maybe knows if there’s been a way to fix this as of yet please let me know. ?
Lol. Still got this damn thing. Been searching around and seen a few people reporting similar errors. Never find out if they ever solve it though.
So. Anyone maybe have any knowledge to share? Anything at all.
I don't know if you still have your device, but I had the exact same issue with a P10 (VTR-L09)
I was able to fix fastboot using https://github.com/mashed-potatoes/PotatoNV
That tool was designed to unlock the bootloader, but I noticed that It actually flashes a slightly modified version of fastboot.
PotatoNV can also unlock P20 lite bootloader, so you should give it a shot.
Good luck!
If it works, you should be able to flash stock recovery image and then restore the system using the dload folder.
you can Repair it with Software Testpoint and Full Bootloader Unlock ,and then flash a Board Software via Software Testpoint, that helps 100%!!!
use this Firmware Download ANE-LX1
use the Software with logins and you have all what you need.
you must start the Software Testpoint so!!
VIDEO : how to start Software Testpoint P20 Lite
than in Software Testpoint you flash the included Board Software with DC-Phoenix and after that use the included dload update via sdcard and eRecovery mode and your Phone is running!!!
I would unlock the bootloader via Software Testpoint with DC-Phoenix, then the FBLock is unlocked and you can flash as you wish!!!! And the great thing about it is that you don't need an UnlockKey either, you can then read this with HCU client software, the only thing that's stupid is that you need a time-based license for the two programs, which you have to buy.
HCU client download
https://hcu-client.com
DC Phoenix download
https://forum.dc-unlocker.com/forum/modems-and-phones/huawei/155916-dc-phoenix
Since I accidentally bought a 3-day license twice and my P20 Lite is now completely rooted on Lineage 19.1, I can give away 2 access data, which are still valid for 2 days.
you can edit your smartphone with it.
username : bl26457
password : kKncnkMj
username : bl26390
password : JDAZqnkN
Then I wish you a lot of fun with it, hope it helps you if someone else is active in this thread.
Hello,
The last week or so I have been trying to flash TWRP onto my Samsung Galaxy A40 (SM-A405FN) to install LineageOS. However, as I started following different guides and methods I have run into several problems that I can't get around and I was wondering if anyone here has had a similar experience or knows the solution.
The first problem I ran into was that when trying to flash onto the phone, neither ADB nor Fastboot detected the phone in download mode (when it was turned on normally they did). I tried various things to solve it: uninstalling and reinstalling different drivers, trying to find the device in device manager (it wasn't there) and nothing worked. I got around it, however, using Odin to flash. Odin did recognize the phone. I had already unlocked the bootloader and made sure VaultKeeper didn't lock it again. I believe it is fully unlocked now, I have even waited the week period to remove the RMM thing (I'm not entirely sure what it is and if I've done it properly, it's been a while since I've messed with android, but it used to display "KG state: checking" and now it's gone).
So, with Odin recognizing the phone I tried to flash the official TWRP recovery for it, following the instructions on the website. However, after flashing it, the phone bricks and boots into download mode all the time, with the error "Error validating footer (6)" on the top left corner. I have googled far and wide and the only solution I find is to reflash the stock ROM. Of course, this works, but I would like to be able to install LineageOS on the phone.
Thank you for in advance and let me know if you need more information or pictures of some sort.
Bump
Hello,
You can try the tuto on the following link:
It's for samsung A20, but you can apply the same practice for the samsung A40.
The first part of this tuto is woking for me (TWRP) but not the last one: "Rmm bypass"
Best regard's, Gregory