it's an unofficial firmware update for original R4 cart with ton of game to fix up to Wood RPG update fix
it's known to many update fix as well as Mario RPG 3 fix, SMT Strange Journey, and more DSi too is said to be supported

so time to dust off the old R4 as enjoy the same update fix as Woo AKRPG update
too bad mine's R4 SDHC, my EDGE still work though