Being using R4 card and was working fine then dont know what my daughter did but its now saying "system date error please check NDS system data"
If you have a backup of the firmware, format the sd and reinstall the firmware. if you have no backup make sure when you download one that you get the right one, there are over 40 types of R4 cards. If you have no backup, copy everything from the sd to your computer (any file errors may be the cause of the issue - delete these files). Format the SD and put the firmware files back on, try the card and see if it boots.
