The main difference between M3 REAL and M3i Zero is possibility to update the core (and DSi compatibility). This protects you for future possible flash cards blocking by nintendo and the Dsi compatibility.
M3i Zero - Unique technique, from Zero to Infinity (0 -> ∞ ): 1) upgradable "Boot Flash data" 2) upgradable "Kernel" 3) upgradable "Firmware"
(Maximize the ability to cope with the new DSi and coming game protection.)
This product does not contain any copyright data or firmware program, though users may upgrade the software to make M3i Zero become the most powerful flash cart...
Features of M3i Zero:
Compatible with DS , DSl & DSi .
100% game compatibility .
Supports Real Time Save function . (Save & Restore anytime, anywhere.)
Supports Multi-Language System (English,French ,Germany , Italian , Spain , Portuguese, Dutch, Korea & Thai Language .)
Continue to update & frequency enhance software/ firmware.
Support micro SDHC (capacity over 4GB, 8GB ,16GB & 32GB …)