Hacking R4i Sdhc save problem

[the tracker]

Hello

I Got A problem with my R4i sdhc The one with red box


any way the problem i play some roms some time it says problem with sav... please rest
and some time i play the game when it start the game say problem with saving and some time i start the game and there is no save at all !!
and every time i do thing like back up its freeze and after restarting its work help


info :
R4i SD hc
Micro SD Hc 4gb Kingston FAT
Nintendo dsi V1.4
R4i Firm Ware : Don't know


any more info please ask ^^