Question Pixel 5a Corrupt Bootloader!!!!.

[Kavin_NK]

I was flashing a new pixel experience rom from my rooted stock rom. I faced few issues during flashing which made my phone to crash. Tried several articles to recover the device using TWRP custom recovery. The bootloader shows the Product revision as unknown MP1.0(Unknown).



(bootloader) product:unknown


(bootloader) serialno:09091FDD40035M


(bootloader) variant:SM7 UFS


(bootloader) max-download-size:0x10000000


(bootloader) slot-suffixes:_a,_b


(bootloader) version-bootloader:b9-0.5-9825789


(bootloader) version-baseband:g7250-00258-230508-B-10084095


(bootloader) secure-bootRODUCTION


(bootloader) secure:yes


(bootloader) hw-revision:MP1.0


(bootloader) is-userspace:no


(bootloader) slot-count:2


(bootloader) current-slot:a


(bootloader) unlocked:yes


(bootloader) nos-production:yes


(bootloader) off-mode-charge:1


(bootloader) slot-retry-count:a:2


(bootloader) slot-unbootable:a:no


(bootloader) slot-successful:a:no


(bootloader) slot-retry-count:b:3


(bootloader) slot-unbootable:b:no


(bootloader) slot-successful:b:no


(bootloader) battery-voltage:3716


(bootloader) battery-soc-ok:yes


(bootloader) snapshot-update-status:none


(bootloader) storage-vendor:MICRON


(bootloader) storage-model:MT128GASAO4U21


(bootloader) storage-rev:0302


(bootloader) citadel-fw:0.0.3/chunk_ab7976980-a9084b7 2021-12-07 18:40:23


(bootloader) auto-shutdown:1

The fastbootd is not working in userspace aswell so could not flash the factory frimware using the flash-all.sh script. When rebooting to fastboot the device reboots into the bootloop. Can someone point me in the right direction on how to resolve this ?

 

[V0latyle]

I was flashing a new pixel experience rom from my rooted stock rom. I faced few issues during flashing which made my phone to crash. Tried several articles to recover the device using TWRP custom recovery. The bootloader shows the Product revision as unknown MP1.0(Unknown).


The fastbootd is not working in userspace aswell so could not flash the factory frimware using the flash-all.sh script. When rebooting to fastboot the device reboots into the bootloop. Can someone point me in the right direction on how to resolve this ?

Download the factory update image and reflash the bootloader to both slots.

Posting identifiable information such as your serial number or IMEI is not a good idea.

 

[Kavin_NK]

Thanks for the reply @V0latyle . I have tried this several time and still the same issue persists. I have tried flashing all the img files after flashing the bootloader and radio img too, after that using fastboot flashall -w also reboots to fastboot which keeps on into a bootloop and the terminal keeps waiting forever.

 

[V0latyle]

Hmm...

Try the Android Flash Tool. Make sure you select the "Wipe Device" and "Force flash all partitions" options.

 

[Kavin_NK]

The android flash tool dosen't pick up the device as Barbet itself. It shows the device as unsupported. Is this anything related to partition corruption. If so is there a way to recover it using MSM tool or Qqualcomm Flash tool (GPST/QFIL).

 

[Kavin_NK]

Why does the bootloader indicate the product revision as Unknown, Does it mean the motherboard is corrupted?

 

[Kavin_NK]

Does anyone have the mbn files for flashing via QPST tool for Pixel 5A. Running out of methods to try recovering from a corrupt "fastbootd" not allowing to flash parts of the firmware, which is to be flashed from userspace fastboot.

 

[rchris494]

Thanks for the reply @V0latyle . I have tried this several time and still the same issue persists. I have tried flashing all the img files after flashing the bootloader and radio img too, after that using fastboot flashall -w also reboots to fastboot which keeps on into a bootloop and the terminal keeps waiting forever.

i notice you are only flashing slot b. pixel phone have both A & B slot.

have you tried
fastboot flash --slot all boot boot.img ?
this will flash both A & B slot

you will probably have to do this manually by downloading the factory image from google (use either the same version you had or later) and using payload dumper to extract all of the files from the payload.bin.

i made this batch file a while back that flashes both A&B slots for ever .img in the correct order. it is generic and works for multiple devices. i just modified it to flash both A&B slots. i had to use it on my pixel 5a to come back to stock from a calyxos rom flash.

flash.bat

drive.google.com

google trash web flasher i don't think does this correctly. it is more for people who don't know how to use adb & fastboot.

your product version should say barbet MP1.0(NA) or at least that is what my US google factory unlocked pixel 5a says.

 

[Kavin_NK]

Yes but my product version says Unknown. Where does this info come from? Is there a way to manually flash this product revision codes. The flashing of the stock rom with android 13 with flash-all.bat completes successfully. But there is no change in the behaviour of booting up. The device boot loops when turned on. When forced to boot loader via key combo shows as Product revision is unknown. The Android 12 Image fails at the "Fastboot reboot fastboot" command when the device starts to boot loop and does not reach userspace "fastbootd" at all.

 

[TechX1991]

when flashing a rom in twrp, some roms will have their own product revision. If it crashes before it gets to the point of the rom writing that, it can corrupt the device.

In my experience with pixel's, your only option might be google warranty