Hello! I flash eng rom on redmi 6a.
How to unlock now boot on this firmware?
Good sir, eng firmware is used for repairs, if you flash an eng rom firmware without having to repair, be aware that it will lose, the imeis, efs, etc and then it will have to be repaired.
To unlock the bootloader of that xiaomi model you have to downgrade to miui 9 and with the miunlock software unlock the bootloader, I hope the explanation was useful for you, thank you very much.