After Xmenu.dat

Question

I got the error xmenu.dat error n my ds lite Ncard after deleting and adding new games. I downloaded the dat file and drag it into the Ncard, but now the ds console is showing a different message such:
UDISKBIOS UPDATE 3.2
verifing package .......ok
press A to continue update
press B to cancel updating

end either option (A or B) will result in asking to restart the console. And when I restart it, the message above will come all over again.

Pleeeeeeeeeease help!!!