Same here. Tried doing a device reset while it was working and now only boots into recovery as the os doesnt load. Cant do adb as cannot see the device in windows... thoughts? Thank you
I must say I am still learning. I figured out the basics

and am ok now.
With Vol Down + Power I booted into fastboot (learned what is

....now my Windows was seeing the device)
then...
fastboot oem unlock-go
fastboot oem device-info
fastboot flash recovery twrp-3.3.0-1-x2.img
fastboot reboot
!!! & quick Vol Up + Power to boot into RECOVERY (Vol Up key only)
TWRP loaded a few seconds after seing the "RECOVERY" factory screen
Chose Wipe
Format Data
...back to home
Wipe
Dalvik
Cache
data
Back to Home
Install Firmware/ROM/Gaps
After its done select Wipe Cache and Dalvik
Reboot
... back in Business!
Thank you so much for this site all the information. Its a real blessing!