Sup: M3 Custom Firmware

Use the SD Association’s SD Formatter tool. Format the card to FAT32 (not exFAT or NTFS). If your SD card is over 32GB, use a tool like guiformat to force FAT32.

The gold standard for simplicity. Minimal interface, instant resume, and rock-solid save states. sup m3 custom firmware

You should now see the RetroSup logo. Navigate using the D-pad and the A/B buttons. Go to the GAMES menu. If you see your ROMs listed, congratulations – you have successfully installed SUP M3 custom firmware! Use the SD Association’s SD Formatter tool

If you want a more "console-like" experience with pre-configured bezels and shaders, TheRA is your pick. Also, hardware revisions matter

Not full CFW, but a cleaned-up stock image with the cruft removed.

Not everything is roses. Here’s what you lose or risk:

Also, hardware revisions matter. If you have a V2.0 with the Allwinner F1C200s, many CFW builds simply won’t boot. Always check the device-specific threads on Reddit or Discord before flashing.