Boot your device into Twrp recovery and choose the Install option
At the bottom corner, you should “Install Image” and select it.
Navigate to the New TWRP image file and then select Recovery.
Swipe to flash and reboot your system, that’s it.
hello dear please can someone help me
since yesterday i install last eu rom 10.2.1 based on oreo om my Mi 5x by trebble always goes well, installation is complete but when the phone reboot to finish installation the phone is on the Mi powered by Android page continues to download since yesterday, please help me to resolve this issue