If you want a more "console-like" experience with pre-configured bezels and shaders, TheRA is your pick.
RetroSup supports a previews folder. Place 80x80 pixel PNG images named exactly the same as your ROM (e.g., Contra.nes.png) inside GAMES/NES/previews/.
Yes — if you’re comfortable with:
No — if you just want to play Mario World on your lunch break. Buy a Miyoo Mini Plus or Anbernic RG35XX instead.
But if you already own a SUP M3, and you’re frustrated by its sluggish menus and unreliable saves, CFW turns a landfill-bound toy into a daily driver. The community has done remarkable work reverse-engineering a device the manufacturer abandoned six months after release. sup m3 custom firmware
| Metric | Stock Firmware | Custom Firmware (GarlicOS) | |-------------------------|-----------------------|----------------------------| | Boot to game (seconds) | 22 | 6 | | GBA frame drops (%) | 15–20% | <1% (with overclock) | | Save state corruption | ~1 in 20 saves | 0 in 100 (tested) | | Button remapping | No | Full per-emulator | | Battery life (hours) | 3.5 | 5.2 (undervolt profile) | | Sleep mode power drain | 8% per hour | 1% per hour |
The difference is stark. A CFW SUP M3 runs circles around its stock self — and honestly competes with devices twice its price. If you want a more "console-like" experience with
Some CFW builds include a hidden menu (press Select + Volume Up) that allows you to increase the CPU clock from 336MHz to 400MHz. This improves SNES and GBA emulation but drains the battery 30% faster.