Fastboot error after changing battery

[4I-I]

So I bought a used Pixel 3, flashed CalyxOs and relocked the bootloader.
After a while I realized the battery wasn't holding up so well and checked with an app which said I have 75% of the actual battery size left.
I bought a new Battery and glass back (the old one was broken) and followed a guide on youtube to replace the battery.
I haven't attached the back glass yet because the phone always boots into fastboot mode and throws some errors:

• NOS-production: error
• Device-State: error!
• Enter Reason: failed to load/verify boot images

I can't access recovery mode or anything else, the phone always reboots to the same fastboot screen.
I also can't unlock the bootloader or flash a different rom.
Does anybody have an idea what the problem could be? I am pretty sure I didn't damage anything in the phone.
I attached a photo of the fastboot screen below.
Any help would be welcome!

 

[rgviva]

hi i have the same issue. did you manage to fix it?

 

[wangdaning]

Did not see this the first time, try reflashing the boot.img of the rom you are using and see if this helps. I think battery info is linked to kernel, so the boot partition probably gets messed up with new battery.

 

[rgviva]

Did not see this the first time, try reflashing the boot.img of the rom you are using and see if this helps. I think battery info is linked to kernel, so the boot partition probably gets messed up with new battery.

any flash attempt fails with timeout as described in https://forum.xda-developers.com/pixel-3-xl/help/remote-error-getting-device-locked-t3884115

 

[wangdaning]

any flash attempt fails with timeout as described in https://forum.xda-developers.com/pixel-3-xl/help/remote-error-getting-device-locked-t3884115

Missed the part about relocking bootloader, if that is the case I believe you are completely out of options.

 

[Shawn haz root]

Can you put the old battery back and see if it at least gets you back square one?

 

[rgviva]

Can you put the old battery back and see if it at least gets you back square one?

it does not come back with the old battery. i inspected the board under a digital microscope and i found that at least one capacitor got dislodged, probably from when i was cleaning the chassis from the old glue residue. I did not apply much force. i suspect that some of the soldering joints on the pixel 3 are fragile and come off very easily. This could explain other similar cases as well. Soldering 0402 components is beyond my abilities.... it is a shame that an expensive phone is brought down by a component that costs less than a cent. Sighh...

 

[tjsooley]

I changed my battery afew weeks ago. Bootloader has never been unlocked and on stock. having no issues
I think your issue came when you installed a rom then relocked your bootloader