R4 SDHC freeze help

I just download the latest version for my r4 sdhc by just replacing the old files (_system_,moonshl,_ds_menu.DAT,and _ds_mshl.nds),but when i restart my ds it freezes at the loading point....can someone help~?

Make sure you downloaded the correct firmware. There are a couple of "R4 SDHC" cards out there.
www.linfoxdomain.com/ds