Hello!
Thanks for reading this thread, there's a lot that I'm about to say based on what has happened for the past 8 hours of troubleshooting.
I hope you'll be able to help me regarding my issue.
Everything was going well as I on my way to unlock my bootloader (done) and root my device.
After rooting via TWRP, I'm stuck on the white XPERIA logo screen.
Proceeded to wipe my phone, and thanks to my stupidity, loss of OS.
Downloaded an GLOBAL OS online, tried to flash into my device with FlashTool.
Error came to me as I needed flash script.
Search online, to no avail, I went to my final option
I saw a tutorial of creating a pre-rooted ROM : https://forum.xda-developers.com/crossdevice-dev/sony/tool-prfcreator-easily-create-pre-t2859904
I attached my OS I previously downloaded which i tried to flash with FlashTool, attached SuperSu into the application and a flashablezip (as instructed).
Flashed this pre-rooted ROM into my device using TWRP, rebooted.
New problem: Stuck at white Sony logo, couldn't enter TWRP.
Flashed in via cmd.exe a working boot.img & recovery.img.
TWRP now works, but I'm back to square one : stuck at the white XPERIA logo screen.
If you've read all of that, I thank you so much for doing so.
I hope that you'll be able to help me after these gruesome 8-hours of researching, trial & error session.
It's about time I requested help from professionals.
Thank you!
Edit : I can boot up my phone now, however that's achievable by removing SuperSu via TWRP.
This is no longer an urgent need for help, but it will be nice if I could get an idea why would I be stuck at the XPERIA logo screen when SuperSu is installed.
Mercuryus said:
Hello!
Thanks for reading this thread, there's a lot that I'm about to say based on what has happened for the past 8 hours of troubleshooting.
I hope you'll be able to help me regarding my issue.
Everything was going well as I on my way to unlock my bootloader (done) and root my device.
After rooting via TWRP, I'm stuck on the white XPERIA logo screen.
Proceeded to wipe my phone, and thanks to my stupidity, loss of OS.
Downloaded an GLOBAL OS online, tried to flash into my device with FlashTool.
Error came to me as I needed flash script.
Search online, to no avail, I went to my final option
I saw a tutorial of creating a pre-rooted ROM : https://forum.xda-developers.com/crossdevice-dev/sony/tool-prfcreator-easily-create-pre-t2859904
I attached my OS I previously downloaded which i tried to flash with FlashTool, attached SuperSu into the application and a flashablezip (as instructed).
Flashed this pre-rooted ROM into my device using TWRP, rebooted.
New problem: Stuck at white Sony logo, couldn't enter TWRP.
Flashed in via cmd.exe a working boot.img & recovery.img.
TWRP now works, but I'm back to square one : stuck at the white XPERIA logo screen.
If you've read all of that, I thank you so much for doing so.
I hope that you'll be able to help me after these gruesome 8-hours of researching, trial & error session.
It's about time I requested help from professionals.
Thank you!
Edit : I can boot up my phone now, however that's achievable by removing SuperSu via TWRP.
This is no longer an urgent need for help, but it will be nice if I could get an idea why would I be stuck at the XPERIA logo screen when SuperSu is installed.
Click to expand...
Click to collapse
Hi, without any logcat it will be very hard to help you
Related
Hi! I've managed to brick my device (d610ar) badly, i think
the device doesn't boot normally (message "Secure booting error! Cause: boot certification verify.", and i am stuck there), can't charge it with the wall charger, and the only thing that works is download mode; but flashing a kdz with LG FlashTool (the way i went back to stock a few times) says flashing and at 2% (or 3% sometimes) it says that doesn't find the device, that i have pull out the battery to reconnect my device again and when i do that it does the same thing on a loop, asking to do it again later..
the funny thing is that it appears on device manager on windows, on com port 11 for example, but the FlashTool doesn't recognize it..
so, i can't flash any kdz and doesn't boot.. i've read around here in xda to enter fastboot to fix it, but.. can this device enter fastboot? i couldn't do it, tried adb too and couldn't make the device visible..
i, before this happened, had multirom installed, rebooted to recovery and deleted secondary roms to install in primary rom cm12.1.. there started to happen strange things when rebooted normally to configure it..
after a while trying to boot found around here in xda too that i could enter twrp recovery via hardware keys to reinstall again, so got into it and installed a flashable zip to come back to stock KitKat directly, that have worked for me before..
after that rebooted and i can't do anything else than download mode..
i kinda figured that the problem must be that multirom injected the boot sector after installing the stock flashable zip, and when i did that restored the stock aboot and abootb (these, modified carefully, allowed us to unlock bootloader and flash recoveries, etc, etc.. ; by the way, many thanks to the devs that discovered it and made the guides!)..
now i have read the instructions for flash via fastboot the stock boot.img and so pass the security verification, but i can't enter it..
so, what do you think that could be the next step? or is it really hard bricked and i should forget about it? i'm really hoping to recover it but i don't know what else to do..
sorry for the bad english, not my primary language
thanks for reading and i am hoping to hear some suggestions!
He is not hard bricked you need to flash stock boot and reunlock bootloader if you have custom recovery still installed, but go first with the eazy way search xda about lg flash tool stuck at 2% there some guides to help you get kdz flashed
Thank you very much!
numpea said:
He is not hard bricked you need to flash stock boot and reunlock bootloader if you have custom recovery still installed, but go first with the eazy way search xda about lg flash tool stuck at 2% there some guides to help you get kdz flashed
Click to expand...
Click to collapse
Thank you very much! You made me realize why wasn't working..
Because of you, i started to search threads related with the "flashtool stuck at 2%" and one of the things to look at was a txt file to see what was the problem.. there i found out that the lg FlashTool recognized my device as LGD618..
That's when i realized that i must've messed up when i flashed a lollipop flashable zip for the D618(a while ago), "converting" my cellphone on that model.. so when i connected on download mode and put the LGD610 kdz the comparison of cellphone model and binary model didn't match..
Solution was to flash LGD618 kdz, boot up normally, install towelroot, install supersu, edit a line on build.prop
from persist.multisim.config=dsds to persist.multisim.config=none
rebooted and that's it.. everything works perfectly now! i won't be doing stuff to it for a while
probably will stay stock like that, because now i will be using an OnePlus One in a few days and the G2 mini will be used by my mother, i think..
Thanks again! You saved my device for being bricked forever
i glad i could helped you :good:
I tried installing kitkat having installed lollipop and did not work, also I tried installing lollipop and nothing. Well I think this update lollipop are adding some kind of lock to disallow downgrade or upgrade by KDZ. I try other methods, unlocking bootloader, and install a aboot.img, bricked my phone. I recommend that you do not attempt to unlock the bootloader and install any system image that is not official, or may end up with a dead device.
Hi guys,
Just unlocked my bootloader and began the root process.
I followed part of this guide but without backing up my DRM keys. http://forum.xda-developers.com/z5-compact/general/summary-tutorial-root-sony-xperia-z5-t3360515
I flashed my kernel and the recovery O.K.
fastboot flash recovery recovery.img
flashboot flash boot boot.img
I've tried two versions of TWRP and two different versions of the kernel AndroPlus.
When performing fastboot reboot after flashing both files my phones LED blinks RED once and then does nothing.
Dramatic and scary. What can I do to fix this? When trying to boot without the cable in my phone just vibrates once and does nothing. Screen doesn't light up at all. I'm so worried.
MatMew said:
Hi guys,
Just unlocked my bootloader and began the root process.
I followed part of this guide but without backing up my DRM keys. http://forum.xda-developers.com/z5-compact/general/summary-tutorial-root-sony-xperia-z5-t3360515
I flashed my kernel and the recovery O.K.
fastboot flash recovery recovery.img
flashboot flash boot boot.img
I've tried two versions of TWRP and two different versions of the kernel AndroPlus.
When performing fastboot reboot after flashing both files my phones LED blinks RED once and then does nothing.
Dramatic and scary. What can I do to fix this? When trying to boot without the cable in my phone just vibrates once and does nothing. Screen doesn't light up at all. I'm so worried.
Click to expand...
Click to collapse
did you try to flash first the boot.img and after the recovery ?
acabreram said:
did you try to flash first the boot.img and after the recovery ?
Click to expand...
Click to collapse
I've tried another kernel and it's booting but hanging at the three dots. (bootscreen) been waiting a few minutes. hopefully it gets to system.
MatMew said:
I've tried another kernel and it's booting but hanging at the three dots. (bootscreen) been waiting a few minutes. hopefully it gets to system.
Click to expand...
Click to collapse
Ok yo can try this too
Y tried and working fine root & xposed
It's tus stock kernel but with the habilita to support root
Similar issue for me
I've had almost exactly the same issue today:
- I unlocked boatloader using Sony standard process
- I followed the steps under 'How to Install CM13' within CTXz's guide here
- After flashing the Kernel and THEN the TWRP, I reboot and the phone flashes red LED, then green, then off, then red and then stays on green for a while (screen is blank). My computer registers that there is a new connection by making a sound but doesn't show up any devices that I can see.
- Periodically, I get the device disconnection sound and the green LED goes off, then red comes on, then solid green again until next cycle.
- If I disconnect the cable, the LED goes off. When I try to turn the phone on without cable attached, it buzzes but does nothing - no LEDs. I can't tell whether it is on or not, except that doing hard reset with PWR+Vol.Up gives no reaction.
- When I re-attach cable normally, the red/green LED sequence starts immediately with no need to turn PWR on, which would suggest that the phone is perhaps on.
- I am able to get into bootloader as normal and fastboot registers the device just fine.
- There is no yellow LED
I started with Kernel AndroPlus v24 and TWRP 3.0.0.0.
Failing that, I tried Kernel v20. Then I tried AndroPlus' twrp-2.8.7.0-E5823-32.0.A.6.152.
Have also tried Kernels v20 and v21 with TWRP 3.0.0.0.
I haven't had any fast boot errors - all flashes come back 'OKAY'.
I'd be very grateful for any help? Have I missed something?!
update to my post above:
I used: 'fastboot boot recovery.img' and this fired up the Sony logo with white screen and blue LED. However, after 10 mins of waiting, there was no change in status and I still couldn't get into TWRP with pressing Vol buttons, even after several restarts and unplugging, replugging etc.
Then, I realised the stock ROM on my phone before this whole process was Lollipop 5.1.1 Build 32.0.A.6.200. So, I flashed older versions of the Kernel and TWRP. Now, I can boot into the ROM and use the phone (almost) as normal except, being plugged in, it keeps re-detecting the USB cable. I now also get the Sony boot screen followed by yellow LED.
If I don't touch anything, it boots into the ROM. However, if I press a Vol button while the yellow LED is on during boot, then it just resets.
Thus, I still cannot get into the TWRP interface. Perhaps I need a TWRP version that is specific to my build - the one I have is from AndroPlus website and refers to the previous build (twrp-2.8.7.0-E5823-32.0.A.6.152.img)?
okay, further update (to save someone replying!)
I managed to boot into the system using AndroPlus Kernel v05a (I had Lollipop build ###.200), but still couldn't get into any TWRP.
I then followed the general process explained in this thread, albeit had to do a heck of a lot of research to understand the detail that is omitted from that (otherwise very useful and concise) original post. For example:
- how to actually use Flashtool (installing drivers and then getting hold of the right firmware from within the program);
- the difference between Fastboot and Flashmode;
- having to plug in the phone while it is loaded into the system before then flashing the selected firmware with Flashtool and ONLY THEN unplugging, switching off and booting into Flashmode.
- loading up the system after flashing the Kernel and TWRP so that I connect to computer and re-copy the erased SuperSU .zip file back onto storage, and then re-booting into TWRP and how to flash a zip file with TWRP.
Having now got a stock Marshmallow firmware rooted, my next step is to go back to the original guide I was following and try to install Cyanogen!
Thank you to all the people who have posted help guides throughout this site so that I could piece together what I needed to do - even though it has still taken me about 30 hours of my life to learn all this!
Hopefully my experience might help someone else in due course...
robledog said:
okay, further update (to save someone replying!)
I managed to boot into the system using AndroPlus Kernel v05a (I had Lollipop build ###.200), but still couldn't get into any TWRP.
I then followed the general process explained in this thread, albeit had to do a heck of a lot of research to understand the detail that is omitted from that (otherwise very useful and concise) original post. For example:
- how to actually use Flashtool (installing drivers and then getting hold of the right firmware from within the program);
- the difference between Fastboot and Flashmode;
- having to plug in the phone while it is loaded into the system before then flashing the selected firmware with Flashtool and ONLY THEN unplugging, switching off and booting into Flashmode.
- loading up the system after flashing the Kernel and TWRP so that I connect to computer and re-copy the erased SuperSU .zip file back onto storage, and then re-booting into TWRP and how to flash a zip file with TWRP.
Having now got a stock Marshmallow firmware rooted, my next step is to go back to the original guide I was following and try to install Cyanogen!
Thank you to all the people who have posted help guides throughout this site so that I could piece together what I needed to do - even though it has still taken me about 30 hours of my life to learn all this!
Hopefully my experience might help someone else in due course...
Click to expand...
Click to collapse
I had the same problem and solution is as is written here.
I had to flash Stock Firmware Marshmallow via Flashtool. After this I flashed kernel(boot) and recovery without problems and yellow icon will displayed.
Don't want to warm up this kind of old thread, but I have exactly the same issue (E8523). Would any of you mind to post their (stock) ROM versions which finally worked? I tried almost every combination that came to my mind (Customized CE1 32.2.A.0.224 => v31, several LP versions => more or less 20 to 32...).
Currently after installing the MM I mentioned the stock kernel worked, but when I flash the AndroPlus kernel (fastboot flash boot /path/to/boot.img) it won't boot up, black screen, looks like no dtb found (doesn't even try to load). This is also the message I get when I try to boot this img via fastboot directly.
I am sure I am missing something really stupid (quite new to android devices), but what?
IGNNE said:
Don't want to warm up this kind of old thread, but I have exactly the same issue (E8523). Would any of you mind to post their (stock) ROM versions which finally worked? I tried almost every combination that came to my mind (Customized CE1 32.2.A.0.224 => v31, several LP versions => more or less 20 to 32...).
Currently after installing the MM I mentioned the stock kernel worked, but when I flash the AndroPlus kernel (fastboot flash boot /path/to/boot.img) it won't boot up, black screen, looks like no dtb found (doesn't even try to load). This is also the message I get when I try to boot this img via fastboot directly.
I am sure I am missing something really stupid (quite new to android devices), but what?
Click to expand...
Click to collapse
Pro tip: hold shift and right click inside folder with recover.IMG or voot.IMG to open command prompt from that folder. Then all you have to do is type fastboot flash boot boot.IMG. I suggest trying to put a custom recovery like twrp on and flashing the xpower ROM from that, it will give you everything in one package.
Edit: fwiw I'm pretty sure custom recoveries have been able to flash .IMG fils for a few years now but I've never actually tried it. Might be worth a shot.
Thanks, but I haven't found cmd.exe on my linux machine yet^^ (I suppose wineconsole is cheating )
I know how to flash *stuff* to my phone, but that *stuff* seems only to work if some specific version of stock rom was installed previously. My best guess is the bootloader changes and supports different dtb formats on every version.
Stock Marshmallow 6.0.1 Customized CE1 32.2.A.0.224 does _not_ work for installing any version of AndroPlus kernel (tried a few...). It fails at boot (does not even load system, probably dtb).
Just in case someone might run into similar issues: What finally worked was Stock MM 6.0.1 Customized DE 32.2.A.0.224 with AndroPlus v31. It seems to be some older release (?), it says R2C instead of R9C for Customized CE1.
I could not find this information anywhere on the net (maybe its me), so for those with a slow internet connection the above version should work. You don't have to actually boot it, flashing is enough.
Thanks for sharing the information in this tread, it really helped me to unbrick my phone!
I started with Lollipop on my brand new Z3C and tried to root using AndroPlusKernel v31 / TWRP 3.0. This resulted in a softbick state, only being able to boot in fastboot mode.
After many hours struggling, an upgrade to stock Marshmallow (E5823_32.2.A.0.224) did the trick. This somehow seems ta make the device ready for the new kernel and recovery (I guess it has to do with the partitions in the filesystem).
Anyway, from stock Marshmallow I could start all over and succeeded to flash a custom bootloader, recovery and now have the ability to flash any desired rom! Thanks again.
To updrade to stock MM I used the instructions in this thread:
[GUIDE][18th Dec][4Noobs] Flashing A FTF File Using Flashtool
To set up TWRP recovery I used the instructions in this thread:
[ROM][UNOFFICIAL][6.0.1][E5823/E5803] CyanogenMod 13 for the Sony Xperia Z5C [ALPHA]
The stock rom I used for my E5823 is "E5823_32.2.A.0.224_R1C_CIS Generic_1298-5167.ftf" from xperiablog.net
Since I'm a new registered member I can't post external links
Google it and you're set!
IGNNE said:
Just in case someone might run into similar issues: What finally worked was Stock MM 6.0.1 Customized DE 32.2.A.0.224 with AndroPlus v31. It seems to be some older release (?), it says R2C instead of R9C for Customized CE1.
I could not find this information anywhere on the net (maybe its me), so for those with a slow internet connection the above version should work. You don't have to actually boot it, flashing is enough.
Click to expand...
Click to collapse
I'm having the same problem, where did you get that MM stock version from?
And what do you mean by "you don't have to actually boot it"?
Search for XperiaFirm and Flashtool. There is plenty.
You don't have to start your freshly installed Stock Rom version "...". You just have to flash it (write it to your phone) Now you boot your phone in fastboot mode and flash your custom kernel and mod rom of your choice. Seems to be some incompatible whatever between not matching kernel versions and the "stuff" flashing installs (suspect sth like bootloader, but no idea).
I have flased boot.img nd recovery.img on android 7.1.1 z5 compact my phone won't pass the sony logo
any help ?
---------- Post added at 11:05 AM ---------- Previous post was at 10:54 AM ----------
starchild78 said:
I have flased boot.img nd recovery.img on android 7.1.1 z5 compact my phone won't pass the sony logo
any help ?
Click to expand...
Click to collapse
I've just discovered I can boot into twrp
anything I can do to fix this from there ?
I have the F3213 Single Sim
My phone was rooted with marshmallow thus used flashtool.
Series of steps I took.
Installed Nougat with Flashtool and everything worked perfectly. Enabled usb debugging, OEM Unlock was greyed out but enabled,
Booted into fastboot mode. With the files I downloaded from Android infotech, copied superuser to the device before flashing. I flashed Boot img, recovery img and
Flashed both images fine. Went to restart and bam, flashing Sony logo. I tried every method to boot into recovery to no avail.
Did I go wrong somewhere or forget a step? I followed the guide on And Infotech to the letter. Or was that my mistake for getting these files from them in the first place.
Any insight would be appreciated.
I spent 8 hours trying to fix this but nothing worked. So I just decided to give up and use flashtool all over again and start from scratch.
I am not a noob to flashing phones but by God this phone is by the hardest I've ever tried to flash. I hope someone can point me in the right direction if they know what I did wrong in my previous post.
hey all!
So this is a first for me... I've been rooting and playing with android for a very long time (going back to the g1 days) and this is the first time I've ever seen this.
So I was on an old version of CM and decided it was time to update finally. I had unrooted a long time ago, but was still running cm perfectly fine. I went to install a new version of recovery (so I could update) and now when I try to boot into recovery I just get the oneplus logo. Here's the strange part, the phone isn't soft bricked... I can still boot into android no problem.
Anyone else every seen this problem? Do I need to start over (unlock bootloader, root, recovery, rom)?
Anyone else ever seen this happen on Oneplus One or any other phone for that matter?
Thanks in advance!
Same Problem Here
I am having the same exact issue with my OPX: I wanted to update my old CyanogenMod and for that I needed to update my TWRP. After I flashed it successfully when trying to boot into Recovery it stucks on the 1+ Logo forever.
If I boot into OS it works (the same old CM since I haven't been able to upgrade), Fastboot as well, it's Recovery that doesn't work.
I found some post for the OP3 that state:
WHY AM I STUCK ON THE TWRP SPLASH SCREEN FOR 8 HOURS?
Be patient, wait another 8 hours.
Just kidding, try this while stuck on the loading screen:
adb shell wipe_misc; adb shell reboot recovery
Some devices might somehow get a flag set in misc that tells the bootloader to ignore the android boot image command line.
This results in the kernel not receiving the hardware name (qcom), which then confuses recovery and causes it to wait forever. FOREVER.
Click to expand...
Click to collapse
I tried it and I got the following error:
/system/bin/sh: wipe_misc: not found
Click to expand...
Click to collapse
I don't know what else to do now. Please help.
janc_z said:
I am having the same exact issue with my OPX: I wanted to update my old CyanogenMod and for that I needed to update my TWRP. After I flashed it successfully when trying to boot into Recovery it stucks on the 1+ Logo forever.
If I boot into OS it works (the same old CM since I haven't been able to upgrade), Fastboot as well, it's Recovery that doesn't work.
I found some post for the OP3 that state:
I tried it and I got the following error:
I don't know what else to do now. Please help.
Click to expand...
Click to collapse
I'm guessing we need to do a full wipe, and go back to the begining (root, reflash reocvery, reflash rom), but hoping not...
zbt1985 said:
I'm guessing we need to do a full wipe, and go back to the begining (root, reflash reocvery, reflash rom), but hoping not...
Click to expand...
Click to collapse
I guess you were right! Here's what I did:
- Tried to reflash TWRP using adb. It did flashed it but couldn't boot it and throws error "dtb not found".
- I found this post that first suggested to use the Blue Spark version of the TWRP. I tried adb-ing it and got the same error.
- In a later comment the following video was suggested: https://www.youtube.com/watch?v=kTdKmceC5xU.
- I the downloaded the stock recovery and the stock ROM from this page: https://devs-lab.com/download-oneplus-official-stock-rom.html. Be sure to find the OnePlus X section.
- Using adb I flashed the stock recovery, did a full wipe, rebooted and copied the stock ROM to my SD card.
- Reboot to Recovery, flash from local, selected the Stock ROM zip and let it do its thing.
- Again, from Fastboot I flashed the latest TWRP. I didn't get any errors now!
- Downloaded the Tesla ROM and flashed it using TWRP.
Everything is working fine now!
janc_z said:
I guess you were right! Here's what I did:
- Tried to reflash TWRP using adb. It did flashed it but couldn't boot it and throws error "dtb not found".
- I found this post that first suggested to use the Blue Spark version of the TWRP. I tried adb-ing it and got the same error.
- In a later comment the following video was suggested: https://www.youtube.com/watch?v=kTdKmceC5xU.
- I the downloaded the stock recovery and the stock ROM from this page: https://devs-lab.com/download-oneplus-official-stock-rom.html. Be sure to find the OnePlus X section.
- Using adb I flashed the stock recovery, did a full wipe, rebooted and copied the stock ROM to my SD card.
- Reboot to Recovery, flash from local, selected the Stock ROM zip and let it do its thing.
- Again, from Fastboot I flashed the latest TWRP. I didn't get any errors now!
- Downloaded the Tesla ROM and flashed it using TWRP.
Everything is working fine now!
Click to expand...
Click to collapse
Lucky you!
I on the other hand can't connect via adb, only fastboot...
After reviving my SGP311 with flashtool and firmware SGP311_10.4.B.0.577_Customized_NCB.ftf , I've decided to try TWRP and LineageOS, however after using flashtool and firmware SGP311_10.5.A.0.230_kernel I may have bricked it.
I've used Android 4.3.3 (SGP311_10.4.B.0.577_Customized_NCB.ftf) for a few days, but it's old as s* and I can't install anything on it.
After flashing SGP311_10.5.A.0.230_kernel the SGP311 got stuck in a boot loop after the Sony logo, briefly lighting up the screen over and over again. From this point onwards:
- flashtool fails with "The bundle does not match the connected device"
- Emma doesn't recognize the tablet model and fails with error "This phone is locked"
- Xperia companion complained that the tablet was locked and bootloader was locked.
Any additional tips? I'm open to suggestions ...
Thanks in advance!
I've tried again flashtool 0.9.18.6 with SGP311_10.5.A.0.230_kernel and it flashed sucessfully! But same boot loop problem. Tried to flash again SGP311_10.4.B.0.577_Customized_NCB.ftf and it also worked and it booted successfully! I can't figure out what changed. I'll try again to install TWRP and LineageOS ...
piludovski said:
I've tried again flashtool 0.9.18.6 with SGP311_10.5.A.0.230_kernel and it flashed sucessfully! But same boot loop problem. Tried to flash again SGP311_10.4.B.0.577_Customized_NCB.ftf and it also worked and it booted successfully! I can't figure out what changed. I'll try again to install TWRP and LineageOS ...
Click to expand...
Click to collapse
Glad you made it. I am also in process of reviving my 321. Flashtool fixed it and Emma worked fine after that.
TWRP does not work, spent lot of time with that. Let me know, if you make it through
Got it working! Follow this thread: https://forum.xda-developers.com/xp...de-tutorial-sony-xperia-tablet-z-lte-t3392831
The important part is, that the fastboot included there works, while the one provided by google do not. Do not ask me why...