What's wrong with my R4???

Oh man.. Guys help me.. My R4 version is 15. I don't play my NDS for 1 week.When I turn on my NDS, It says Hardware not compatible..
What's wrong with it??This is my first time...

Try reformatting your microSD card, then try reinstalling the firmware.

version 1.15 is old, the latest version is 1.17, you really ought to always make sure you have the latest firmware before asking for help, 98% of the times this will fix it, the other 1% it can't be fixed at all and the final 1% is for those rare cases. :)

Thx, guys.. It really work.. Thx..

No problem just don't abbreviations for words or IM speak.