Here is the  downloads page for the M3 miniSD:

FIRMWARE:

Game Manager_v36a  -fixes your games up to ~no.2300

Loader Upgrade M3SD e35

older firmwares:

Loader Upgrade M3SD e34

Loader Upgrade M3SD e33

Loader Upgrade M3SD e32

Loader Upgrade M3SD e31

Loader Upgrade M3SD b30c


TOOLS:

M3_Movie_Converter_v1.22 English

M3_rom_dumper

M3_skin_converter

M3_Saveman_2_v1.50

DipStar_Cheatcode_system_for_M3


SKINS:

ndsthemes.com

nintenskinz.tehskeen.com gba mode skins

nintenskinz.tehskeen.com nds mode skins


All Tools and Firmwares here are hosted on linFox Domain ,
one of the best firmware sites ever!
Thank you for hosting this holy files.