All my games won\'t work

I am using r4i with and I recently tried a new firmware, which i found was not compatible to my r4i. I had a back up of mine, so i put all my files back into the card. I was about to play mario kart until it says savfile not founded. please reset system. so i tried phoenix wright, same thing and all my games now get this error. I tried changing the save to have .sav at the end, but nothing works! help me please D:
Post Merge: [time]1264838003[/time]
oh yeah, and renaming files doesn't work, already tried

Back up all your files and then format
check for the newest kernel here: http://www.linfoxdomain.com/nintendo/ds/Otherwise go to the r4i forums and post the problem there or wait here for more answers

Read this thread.
https://www.romulation.org/forum/index.php?topic=1462.0