For all those games on wich appear the message:

The save data could not be accessed. Please turn the power off and reinsert the ds card
or
[Rom loadin failed] Load rom errcode=7, please reset system


Follow these instructions:

1. Go to http://www.linfoxdomain.com/nintendo/ds
2. Download the latest OS software for your card
3. Unzip all the content to a temporary directory
4. Plug your microSD card to your computer
5. Copy all the content you unzipped to the root path of your microSD card overwritting all the files you had
6. Plug your microSD card to your NDS card