Sup M3 Custom Firmware -

: Insert the card into your Sup M3 and power it on. The first boot may take up to 30 seconds or appear upside down; wait for it to finish and then power cycle the device. Hardware Context

Many CFW builds use optimized versions of RetroArch or standalone emulators that reduce lag and fix audio stuttering. sup m3 custom firmware

Custom firmware (CFW) for the SUP M3 Game Box is primarily handled by the : Insert the card into your Sup M3 and power it on