If you’re playing with creating your own watchfaces for the Amazfit Bip by using Valeriy Mironov’s Amazfit Bip Tools (Click Here) to take apart the .BIN and put it back together and the online watchface designer by v1ack (Click Here) then your next step is how to move the watchface to the watch in the easiest way. Following the instructions linked here and easily move the watchface from your phone to the watch via the Mi Fit app!
Source: How to install a personalized watch face on Amazfit Bip via Mi Fit | Startlr Tech Blog