This is the gold standard. RetroSup is a community-driven firmware that completely overhauls the SUP M3.
While specific files vary by version, the process generally follows this flow: sup m3 custom firmware
Unless “sup m3” offers a specific feature you need, the kernels are safer, more updated, and compatible with almost all M3 clones. YSMenu, in particular, removes time bombs and runs on 20+ cart brands. This is the gold standard
Warning: This will wipe your internal storage. Back up your BIOS and saves first. the kernels are safer
So, why should you consider installing custom firmware on your SUP M3? Here are just a few benefits: