1. Download TWRP to PC and rename it to twrp.img https://dl.akr-developers.com/?dir=skkk/TWRP/A12/v3.7_A12
2. Connect the phone to the PC in fastboot mode.
3. Run TWRP fastboot command - fastboot boot twrp.img
4. Install ROM
5. Reboot system
After step 3 the phone reboots and when i get to...