OMG, I just followed this guide and my phone turned on!
https://forum.xda-developers.com/tm...ent/debrick-phone-h901-qualcomm-9008-t3440359
I can boot into TWRP too! I honestly don't know how that happened, it seems like Android is running off the external SD card (if I take it out it doesn't turn on). It says the software version is H90120I, except I'm not sure if the last character is "I" as in India or "L". Is it running off the SD card or was my original flash that bricked it successful?
I'm not sure how to proceed, should I try flashing the V20L ROM at the start of this thread again? I'm almost afraid to do that now that I have the phone back, I almost just want to just use it as is.
When I try to power it off by holding power sometimes it gets stuck on the T-Mobile logo, and sometimes it reboots instead of shutting down. Many thanks to sabresfan for referencing tungkick and his unbrick guide!
---------- Post added at 03:01 PM ---------- Previous post was at 03:00 PM ----------
When you installed this ROM, was it already rooted? Did it also have xposed already?
I did, in fact when I issued the "fastboot reboot" command after flashing the files, my phone became bricked.