In flashcart communities (GBAtemp, DS-Scene, and Reddit’ r/flashcarts), "SUP" was a release group or a prominent developer who took the original M3 source code (or reverse-engineered the kernel) and optimized it.
The "sup m3" custom firmware is not an official product. It is a community-driven kernel that accomplishes the following: sup m3 custom firmware verified
Follow this guide exactly. Do not skip the backup step. In flashcart communities (GBAtemp
Once your custom firmware is running, you need software. These are verified to work on the SUP M3 architecture without crashing. and Reddit’ r/flashcarts)