You can use AmazfitBipTool to extract Res file and paint or any edit picture app to edit img on extracted res.
For AmazfitBipTools, you can find it in forum or here
Link
Hello guy,
This is the first time I created a resource.
Most of the icons are my own, but there are some icons borrowed from other res.
Please try and leave a review so I can make the next version better.
Sorry for bad english.
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Some picture:
Screen:
Loading:
Etc...