Xiaomi has officially announced that the Mi 6X is now equipped with Anti-RollBack protection. In the official statement, they cite that this protection feature has been turned on for the stability of the device and data security, as it has been for many devices.
In case of a developer ruin:
If you install MIUI 10 8.8.6 or later, you cannot revert to a system older than 8.8.6, because the phone will not start, it will be bricked!
For a stable rom:
If you have already upgraded to v9.6.4.0, you cannot revert to an older stable rom, because the phone will not boot, it will brick!
If you do put the previous ruin back despite the call, you will have to visit the nearest official Xiaomi service (not a partner and not Pistike GSM!) and your device will be repaired.
