
Aaron Christophel reverse-engineered the Mi Band 10's BES2700iMP SoC (BEST1503) by adapting a leaked SDK from the similar BEST1306 chip. A custom firmware was assembled and Doom was ported to the device, though display limitations remain. The same SDK should work on the Mi Band 9.
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Summary by ByteBrief
One UI 9.0 for Galaxy Z Fold 7 in development