[Nexus 6 Q&A, Help & Troubleshooting] Mahesha999:
Well this is my second time I am trying to install custom ROM on any android phone. First one was some cheap phone from local brand. And I ended up in bricking that phone. This time it seems I have boot looped beloved Nexus 6. :crying:

So now I know I have very poor experience with MODing stuff.

I decided to install latest lineage OS on my Nexus 6.

I followed steps given on lineageos.org tutorial:

Enabled developer options

Enabled USB debugging

Enabled OEM unlock from developer options

Installed adb drivers

Connected Nexus 6 to PC using USB

Selelcted transfer photos (PTP) mode on nexus 6 in the prmpt that appeared after connecting USB

Booted into fastboot by doing "adb reboot bootloader" command (I have my volume down button screwed up while replacing battery. Though there is no visible damage. I dont know what happened :(. So I was not able to boot into fastboot by holding volume down while mobile powers on. )

Downloaded TWRP and installed it doing "fastboot flash recovery twrp-x-x-x-x-shamu.img" command

The lineageos.org tutorial then asks to boot into recovery using volume down key. But since mine was screwed up, I didnt know how I can do that. So I fiddled a bit in fastboot mode and found that when I press volume up, there comes "recovery mode" option. So I pressed power button when recovery mode is shown when in fastboot mode. It successfully booted in TWRP recovery.

Then I tried to perform the backup from the TWRP. I used to get something "unable to mount..." error. I tried it twice/thrice. Then I booted into Android. I realized that I can run "adb reboot recovery" command to get back into the recovery. So I tried that but then I got No Command error. So I pressed and held power button for some time, it booted into android. I ran "adb reboot bootloader". When in fastboot, I pressed volume till it showed recovery option and then pressed power button to boot into recovery. Then I tried backup again and it worked this time. So it never worked when I boot into TWRP for first time. I had to boot into android and then again back into TWRP (through fastboot) second time for it to work. This pattern repeated for other things.

Then I tried to perform backup of system through TWRP. Somewhat similar thing happened. It was giving "Unable to mount..." error. So I boot into Android, then into fastboot, then into TWRP and it worked. I booted into Android and copy pasted those backup files on my PC.

Then I tried to perform wipe from TWRP. It again gave "Unable to mount..." error. So I again followed above steps. Booting Android -> Fastboot -> TWRP and then performed wipe (I wiped everything cache, system etc). It worked.

Then lineageos.org tutorial asks to put lienageos zip at /sdcard/ using command "adb push filename.zip /sdcard/". I guess I tried it in recovery and it was not working. Hence I selected to reboot in bootloader (or I guess System) from TWRP. (I am not remembering this last steps as I was noting down only those steps which worked in notepad which are explained till last point in this procedure. But I know I rebooted from fastboot after wiping) And thats where I screwed it up :crying: :(. Now only Google logo displays. When I long press power button, the Google logo diappears for a while and reappear. Irony is that my volume down also seems to be screwed. What options I am left with??? :(