Patch IMEI procedure supports all Xiaomi devices with MTK SoCs from now, including MT68XX devices.
List of supported phones:
The phone goes back to its original state after a firmware update or an OTA update, so it’s mandatory to disable automatic OTA updates of the phone.
For further information please visit the following link: https://chimeratool.com/en/docs/mtk-xiaomi-patch-imei .