Semi bricked G630S

[lotherad]

Hello. This forum is probably my last hope to save this phone. I have flashed, rooted, unlocked lots of phones but none of them was so hard to work with like this phone. So the thing is that one day phone bootlooped by itself, now I have unlocked bootloader and when I flash system.img via fastboot it still bootloops, can someone tell me step by step about wiping and flashing this phone? I also have the problem that when I wanna flash cust it says "remote: command not allowed". Thanks.

[quasimode]

Open Bootloader and Flash TWRP via adb fastboot. Go to TWRP (Recovery Mode), in TWRP you have Access to SD-Card. Copy a custom ROM (CM13) to SD Card and Flash it via TWRP. Now your phone should boot again with a custom ROM.