What I have tried:
-Hard Reset with power keys: no impact.
-Factory KDZ flash via these instructions http://forum.xda-developers.com/lg-l...g-l90-t2803479 : doesn't read phone information/ freezes at 1% when I begin the updating process. There is no link on the thread to the B2CAppSetup.exe file that it mentions, so maybe it's a driver issue?
My phone: Rooted D415, no CWM or TWRP, locked BL. When it was working I enabled USB debugging and Unknown Sources, but the factory reset I tried may have ruined that. I can get into Firmware Upgrade mode, and I assume fastboot would still work, for what it's worth.
Any help I can get would be greatly appreciated, thanks!