[Nexus 6P Q&A, Help & Troubleshooting] MarkB16:
Hey Curiousn00b, thanks for sharing your story. It seems really weird that they're just dying so suddenly and so fatally with no hardware failures. I'm wondering if this is part of a larger issue.

I just tried flashing the factory images for MHC19I as per part 11 of Heisenberg's guide and, alas, no luck. The images flashed fine, but it's still doing the same thing as before.

Is there anything else I can do to get it to a usable state again without completely wiping it? Should I try another factory image, maybe an earlier one? And, if I do have to wipe it, can I re-flash TWRP recovery and take a backup first?

Here's my log output for confirmation. Thanks again, I appreciate your reply.

C:\SDK\platform-tools>fastboot flash bootloader C:\angler\images\bootloader-angler-angler-03.51.img
target reported max download size of 494927872 bytes
sending 'bootloader' (3526 KB)...
OKAY [ 0.105s]
writing 'bootloader'...
OKAY [ 0.237s]
finished. total time: 0.345s

C:\SDK\platform-tools>fastboot reboot-bootloader
rebooting into bootloader...
OKAY [ 0.011s]
finished. total time: 0.013s

C:\SDK\platform-tools>fastboot flash radio C:\angler\images\radio-angler-angler-03.61.img
target reported max download size of 494927872 bytes
sending 'radio' (48600 KB)...
OKAY [ 1.202s]
writing 'radio'...
OKAY [ 2.855s]
finished. total time: 4.060s

C:\SDK\platform-tools>fastboot reboot-bootloader
rebooting into bootloader...
OKAY [ 0.014s]
finished. total time: 0.016s

C:\SDK\platform-tools>fastboot flash boot c:\angler\images\boot.img
target reported max download size of 494927872 bytes
sending 'boot' (12045 KB)...
OKAY [ 0.287s]
writing 'boot'...
OKAY [ 0.387s]
finished. total time: 0.676s

C:\SDK\platform-tools>fastboot erase cache
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.036s]
finished. total time: 0.037s

C:\SDK\platform-tools>fastboot flash cache C:\angler\images\cache.img
target reported max download size of 494927872 bytes
erasing 'cache'...
OKAY [ 0.018s]
sending 'cache' (5752 KB)...
OKAY [ 0.161s]
writing 'cache'...
OKAY [ 0.226s]
finished. total time: 0.409s

C:\SDK\platform-tools>fastboot flash recovery C:\angler\images\recovery.img
target reported max download size of 494927872 bytes
sending 'recovery' (12977 KB)...
OKAY [ 0.337s]
writing 'recovery'...
OKAY [ 0.406s]
finished. total time: 0.747s

C:\SDK\platform-tools>fastboot flash system C:\angler\images\system.img
target reported max download size of 494927872 bytes
erasing 'system'...
OKAY [ 0.561s]
sending sparse 'system' (478066 KB)...
OKAY [ 12.529s]
writing 'system'...
OKAY [ 6.772s]
sending sparse 'system' (483054 KB)...
OKAY [ 12.458s]
writing 'system'...
OKAY [ 7.038s]
sending sparse 'system' (480089 KB)...
OKAY [ 12.603s]
writing 'system'...
OKAY [ 14.026s]
sending sparse 'system' (469850 KB)...
OKAY [ 12.264s]
writing 'system'...
OKAY [ 22.259s]
sending sparse 'system' (55828 KB)...
OKAY [ 1.530s]
writing 'system'...
OKAY [ 2.856s]
finished. total time: 104.912s

C:\SDK\platform-tools>fastboot flash vendor C:\angler\images\vendor.img
target reported max download size of 494927872 bytes
sending 'vendor' (185185 KB)...
OKAY [ 4.567s]
writing 'vendor'...
OKAY [ 15.101s]
finished. total time: 19.670s

C:\SDK\platform-tools>fastboot reboot
rebooting...

finished. total time: 0.008s

C:\SDK\platform-tools>