My major screwups:
No nandroid backup.
I have Sprint
I can get to fastboot, recovery and adb works fine. But no matter which recovery/rom combination I try, I get the same end result. My phone will boot to the "HTC One" screen, then go the green HTC logo/white background screen then reboot. Sometimes it stays active long enough to begin the "Welcome to Android" stuff (pick your language, wifi connection, etc...), but not nearly long enough to get through all the screens.
What I've tried so far:
Multiple recovery options including CWM and TWRP. CWM versions 22.214.171.124, 126.96.36.199 touch. TWRP versions 188.8.131.52, 184.108.40.206, 220.127.116.11.
ROMS: ARHD 31.6 and 62.0 (I know this doesn't work with Sprint), Viper 6.1 and some "stock" rom I found somewhere (filename One_4.19.401.11_odexed.zip).
I don't remember exactly the order, but I know I did TWRP 18.104.22.168 and ARHD 62.0 first. Then did Viper 6.1, then ARHD 31.6. Since then, I've tried every combination of recovery and ROM that I can think of.
Here's getvar all:
(bootloader) version: 0.5
(bootloader) version-bootloader: 1.56.0000
(bootloader) version-baseband: N/A
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: XXXXXXXXXXXX
(bootloader) imei: XXXXXXXXXXXXXXX
(bootloader) meid: XXXXXXXXXXXXXXX
(bootloader) product: m7_wls
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN0720000
(bootloader) cidnum: SPCS_001
(bootloader) battery-status: good
(bootloader) battery-voltage: 4205mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-4dab9d12
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
finished. total time: 0.040s
I'm willing to try anything at this point. So suggestions are welcome. You're also welcome to berate me for the above mentioned screwups, but it won't be very helpful.