After the required hours have passed, put your phone back into Fastboot Mode , connect it to the PC, and run the Mi Unlock Tool again to complete the process.
On PC, open Command Prompt and type:
Proceed at your own risk. Always double-check that your device is the and not the Mi 8 or Mi 8 Explorer Edition, as the process differs slightly. How to unlock Bootloader in XIAOMI Mi 8 SE with...