Flash back to sprint from cricket
 

I found a Touch that used to be sprint, but was flashed to cricket, it's a good price, but can I flash it back to sprint? Or can I still use it on sprint with the cricket flash on it? I was hoping just using the pinned sprint rom would work, but when I tried flashing my qwest apache to sprint it said something about country code and failed.

Or should I flash a custom cooked rom first, then try to flash sprint?