Instruction on installing the watchface: You have to choose the watchface that you see in the instruction in online watchfaces of MiFit. Wherein the picture of the watchface that you want to install won't appear on watchface that you press in online watchfaces. It will appear directly on the Mi Band 4. You can do it for sure! Follow the instructions at the link.
Rokitskiy.DEV is the creator of this application that can be found in the Tools category. The app has been downloaded and set up by over 1M users and the latest update was released on Jan 8, 2020. On Google Play, MiBand4 was rated 4.2 by its users.