Unlocked Nexus 6p stuck in boot loop

Question

I have a Nexus 6p that is unlocked and rooted. Last night it restarted unprompted (this has happened a few times since Nougat) and it no longer boots into the OS. I get the initial warning about the unlocked bootloader, the white Google logo with the unlock icon, and then it just keeps on rebooting. I powered it off last night and let it rest but that didn't help.

This morning I downloaded the 7.0.0 (NBD90X, Oct 2016) angler image. I tried flashing boot, cache, recovery, and system manually with fastboot and it was still in a boot loop after restarting. I ran flash-all.bat and that didn't help either. I'm not sure what to try next.

Update: I found the hidden menu in recovery mode (hold power+volume up in the recovery menu). Then was having difficulties getting ADB to recognize the phone when I noticed there was a different ADB version running in the background by Droid Explorer. I got that sorted out and uninstalled when I still couldn't get ADB to see the phone when some combination of uninstalling/reinstalling the USB drivers from google and trying different usb ports finally was able to list a device when running adb devices.

So after running wipe cache partition and running apply update from ADB with the latest OTA update (bootloop), and the latest Marshmallow update (Warning: Nofile_contextThis package is for "angler" devices; this is a "".), I'm still stuck.

Update #2: well since I haven't had any luck with anything so far, I tried doing a factory reset with hardware buttons in the recovery menu. Still boot loops. Are there any other options or should I ship it off to Huawei?

Final Update: since no other options worked I contacted Google Fi and they are sending me a replacement phone. Even though I am a few days beyond the warranty's expiration they are sending it free. (I also contacted Huawei and they comically sent me an email telling me to call their support's phone number.)

Answer 1

From what I understand, you said initially that the phone was unlocked and rooted, added to that, since you get the warning message during boot, the bootloader is also unlocked (evidence is the unlocked symbol that comes up at the bottom center of the screen). I used to run into this trouble while rolling back to stock and clearing userdata and cache before the first boot. What you can do again is:

1. Boot into fastboot.
2. fastboot erase userdata [or fastboot format userdata]
3. fastboot erase cache [or fastboot format cache]
4. fastboot flash radio <<radio img>>
5. fastboot flash bootloader <<bootloader img>>
6. fastboot reboot-bootloader
7. fastboot flash recovery <<recovery img>>
8. fastboot reboot-bootloader
9. fastboot flash boot <<boot img>>
10. fastboot flash system <<system img>> [at this point, you must see it actually recreate the system partition]
11. fastboot flash userdata <>
12. fastboot reboot-bootloader
13. volume up / down and get into recovery mode
14. Power button + vol up [then let go of vol up, then power] to enter recovery options
15. use vol up / down and format the device [I believe it's the last but one option]

Reboot device and sit tight for at least about 10 mins.