(also known as the Game Box Power M3 ) is a popular budget handheld, and while its stock performance can be lacking, there is high-quality custom firmware (CFW) available that significantly improves the experience. Best High-Quality Custom Firmware: MiyooCFW The gold standard for the Sup M3 is
Search for "M3 Game Box UI Mods." Many community members have created custom .bmp or .png assets that you can swap out in the system folder to give the device a modern, minimalist look—think "Analogue Pocket" style aesthetics. Step 3: High-Quality ROM Sets sup m3 custom firmware high quality