do you have the right testmode files? testmode 2.3?
http://avic411.com/i...3-for-20-30-31/
i hope you have created a backup
if it wont boot anymore i think the only way is to do a sd upgrade with format like this
http://avic411.com/index.php?/topic/22844-complete-30-install-guide/
when you format.. normally it should work..