help !! a few games wont load past start screen on ttds

hi i have a ttds cart i have quite a few different roms on it but i still hve some like weres waldo & tropix and a few more that either wont load or go to a blank screen or half way thru game goes to blank screen or comes up with error4
can sme one help me
:'( :'( :'(

Backup all your files and reformat your MicroSD. Make sure you have the latest (unofficial) firmware. http://linfoxdomain.com/ds/