stockrom

I was trying to backup of stock ROM through twrp backup without installing by loading fastboot boot twrp.img and take backup of stock rom system.img userdata.img through twrp recovery... it loaded successfully but while taking backup its not able to take backup its giving error that it "cant...

I NEED Help device :- vibe x3 I tried to install stock ROM via QFIL but it says "no port available" when i try to connect phone via USB. i have USB driver installed. but it is not detecting the phone and after switch off the phone i tried it to connect to the PC and screen is on infinite boot...