Download MIUI V188.8.131.52 China Stable Recovery ROM for Xiaomi Mi 8 Explorer from here.
Archive name: miui_MI8Explorer_V184.108.40.206.QEHCNXM_ed3a873415_10.0.zip
Xiaomi Device name code: ursa
Android version: 10.0
Size: 2.4 GB
Caution Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.