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This is the DTBO image for the Xiaomi Mi8.
Flashing this image will resolve any issues, caused by flashing the DTBO from another device, most likely attempting to improve your refresh rate ( Don't bother attempting to change your refresh rate) the Mi8 panel was not designed to go any higher that where it is at default. Plus, you could possibly full brick your device.
Additional Information:
To install this file
1. Flash it with ADB :
2. fastboot flash dtbo dtbo.img
FYI The instructions to flash any partition are identical with flashing the TWRP recovery partition.