Your Miband doesn't want to use all 3 watchface slots? Well, that's most likely because all of your watchfaces share the same ID. The miband thinks that all your watchfaces are the same. Fix this with this guide!
On the Mi Band 5, you can store 3 different custom watchfaces. There are 3...
Thanks for the guide! How do you change the ID of a watchface?
Edit: I just found it out myself. See Mi Band 5 - How to give your watchface an unique ID | GeekDoing for a tutorial