So my problem started going from custom to stock rom. The only time i can access twrp is after flashing the stock rom . However with stock my imei and lte are gone . ive tried the work arounds for this and can get my lte back the problem is that when i go back to twrp to back up efs im locked out by a code i didnt set . i have yet to get gapps to flash on the custom rom error 20 .what do i do ? i have a phone but no gapps