Go ahead and format it. If you have tunes on there that you NEED to keep, just copy them to your desktop like the WAR Chip is a memory stick.
iv done that but now i cant write any map settings on. each time i try it writes it but when i try reading the chip i keep on getting a message saying
problem reading file data from chip.
try uploading files to chip before attempting to read from the chip.
iv tried to write a map to the chip a few times and keep on getting the same message.
my number is 07872994371 if it helps