Question Bootloader serial_mismatch after flashing stock - OnePlus Nord 2 5G

Title.
After playing around with root and some custom ROMs i wanted to return to OOS, I had a few troubles doing that but eventually I succeeded.
I still wanted to have root access though so I tried going to flash TWRP, but was met by the message "serial_mismatch" followed by a system reboot.
This is persistent, regardless off physically trying to boot in to bootloader or through adb.
Fastbootd works, I can flash stuff with success but it seems like it doesn't actually flash since I can't boot into TWRP after flashing it in fastbootd.
I tried mtkclient, both on windows and on livedvd, my device gets found but on windows I get handshake failed until it ultimately reboots and on livedvd it gets stuck on "trying kamakiri2" endlessly.
Also, my safetynet check fails, even though I am on stock everything without root!
Any thoughts on what I can do here?
All help is greatly appreciated.

Hi there, what version of OxygenOS are you currently using?

Currently on 12.1 latest update (DN2013_11_C11). I tried the downgrade packages but as I can't access recovery or fastboot I can't downgrade either.

Please try this method: https://community.oneplus.com/thread/1596759 After downgrade you will have option to relock your phone and safetynet should pass. Let me know if it helped.

Thanks, already tried that but it fails to rollback as well

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Hi friends,
So here's a thing:
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So no issues, I used the Wugfresh nexus toolkit to flash it back to stock and unroot. Bootloader is still unlocked, so I just root it again and go ahead and try to install the update using Wugfresh. It works, but says the vendor.img is wrong. So I downloaded the correct vendor.img and tried to flash it, but of course because the tablet is encrypted TWRP asked for a password. I hit cancel and tried to continue, but Wugfresh just hung at that step.
So I tried to manually flash the ROM, but now it gives me a vendor.img error and will not flash anything. Trying to flash anything sends the device in a bootloop.
TLDR; I can restore to stock and root, and also access the bootloader and recovery (TWRP) but can't flash anything without sending the device in a bootloop.
I've currently restored the tablet to stock via wugfresh's tool and rooted. So I'm back at the beginning, except with this vendor.img issue when I'm trying to flash a ROM.
Anyone have any ideas?

Please someone help me with my SM-P600 XAR

Hi, I am using P600 (note 10.1 2014 Wifi) XAR one
Yesterday I was trying to install magisk all day, but failed all
When I rooted device and instaled TWRP, in TWRP it made error number 1 and it says something like turn to stock boot, so I tried to reinstall stock firmware via Odin, but it didn’t change anything.
I guess it’s a problem with boot.img or the autoroot method I used.
So I tried to use fastboot to install TWRP without rooting, but this time it didn’t boot into bootloader from fastboot, it just restarted the tablet all the time.
So I tried to manually reboot into the download mode, but fastboot didn’t recognize the device then.
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Then tried option “reboot to boorloader” and it just restarts the tablet again.
I guess something corrupted boot.img or bootloader somehow, while I was rooting or something.
Can I get factory boot.img and solve it? Or when I install stock firmware via Odin does it also fix boot.img and boot loader?
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Bump

Locked out of recovery after trying to update TWRP. Help?

I'm having major problems with TWRP, and I need help.
I have a Samsung Galaxy S4 with a properly unlocked bootloader (MDL), rooted, that has had a working version of TWRP 2.8.7.0 and running an older version of Cyanogen.
I'm overhauling the phone, so the first thing I tried to do was to update TWRP.
Since TWRP v2.8.7 supports flashing itself, I booted into recovery and flashed the TWRP update (v3.2.1.0) directly through TWRP. No errors that I saw.
But when I try to boot into recovery, I now get "System Software Not Authorized By AT&T Has Been Found On Your Phone". Fortunately, I can still boot normally - it's only recovery that I'm locked out of.
In trying to fix this, I tried re-flashing TWRP with three different methods:
1. I tried to flash TWRP again through the TWRP app. But I get "Flash Failed".
2. I tried Odin and got "FAIL! (Auth)"
3. I tried flashing v3.2.2.0 using the dd method. This I was able to do without any errors, but I'm still locked out of recovery mode with that same "System Software Not Authorized By AT&T Has Been Found On Your Phone" error.
Help?
Try connect to computer and execute:
adb reboot bootloader
fastboot flash recovery twrp-xxxx-xxx.img
Everything should be good to go.
Note: ALL TWRP settings will be reset.
HippoInWindow said:
Try connect to computer and execute:
adb reboot bootloader
fastboot flash recovery twrp-xxxx-xxx.img
Everything should be good to go.
Note: ALL TWRP settings will be reset.
Click to expand...
Click to collapse
ADB works fine for me, but fastboot does not. It says "waiting for any device". From what I understand, this is a common issue with Samsung phones. I'm using Windows 10, if that helps.
However, I came across a bug report for TWRP here, that reports the exact same problem from 3.0.0.0, and it's still open. That tells me that this may be a general issue with TWRP that they never bothered to fix.
So on a hunch, I tried re-flashing v2.8.7 using the dd method (since that's the only one I can get to work). And SUCCESS! I can now boot into recovery again!
So here's what I need to know:
1. Is there any way to get the latest version of TWRP to work on this phone?
2. Is it safe to flash a current version of LineageOS using this version of TWRP (v2.8.7)?
I'm really wary about that second question, because the last thing I want to do is brick my phone because an old version of TWRP doesn't know how to work with a new version of Lineage/Android. (This phone currently has KitKat on it)
You need Rashr to do this. You can find this app on the Google Play Store which can flash images in your system.
1. This version of TWRP should be able to flash modern LineageOS.
2. Using the above method provided should get you up and running the latest TWRP.
HippoInWindow said:
You need Rashr to do this. You can find this app on the Google Play Store which can flash images in your system.
1. This version of TWRP should be able to flash modern LineageOS.
2. Using the above method provided should get you up and running the latest TWRP.
Click to expand...
Click to collapse
I finally found an explanation and solution - it would appear that TWRP 3.x does not have the Loki exploit applied. So nothing 3.0+ will work unless it's been Lokied.
Fortunately, the current versions can be Loki patched, so once that's done, they'll install and work properly. Whew!

Help Locking Bootloader/Returning to Stock

Hi All,
I'm really stuck on this so any help would be much appreciated.
I recently unlocked my phone in order to install TWRP & root with magisk. This all seems to work but as soon as I boot to EMUI magisk manager reports Magisk is not installed. Then when I try going back to TWRP to re-flash its gone as well. TBH I don't need root and its proving way harder to do on this phone than I've found in the past.
I really want to return to stock with full lock but can't work out how to do it. Just doing 'fastboot oem lock' and 'fastboot oem relock <code>' fails. I've also tried to use HuRUpdater using the guide here but my storage is encrypted so I can' t get at the files in the first place. Plus I have to reflash TWRP everytime. And ADB push doesn't seem to help get the files over either.
So very stuck! Any help would be greatly appreciated
I'm currently on 9.0.0.159(C432E4R1P9)
Thanks

LG G5 help with unbricking

Hello,
I have a H830tmobile, have had LineageOS for the past 7 months, but recently figured out I didnt have TWRP when trying to find a system file. While trying to install it, I got dumb and bricked my phone.
Thankfully I unbricked it that time, installed vannila ROM H83020i and downgraded to H83020a. I downgraded because it didnt let me use most fastboot commands and couldn't flash TWRP(flashing,booting,...), keep in mind it didn't let me on LineageOS too.
After that I rooted it using Hard Recovwery Method and flashed TWRP. Everything was going great until now, I found out that my phone doesnt show up on PC while in TWRP, would show up without problems in adb or fastboot. After continuing on through the guide, I formatted data, went back to boot into system and got a message that encryption was unsuccesful. Rebooted back into TWRP, searched for a fix and factory reset the phone, didn't help. I read that I should reformat only the System to ext4, did that and phone is without OS and boots endlessly. While trying to go into recovery mode through fastboot commands, it only sends me into endless boot and I can not get into TWRP and even if I could, I wouldn't be able to flash LineageOS as my phone just doesn't show up on PC.
Is this saveable or not?
ok booted into vanilla os again through uppercut, gonna try flashing lineageos only this time

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