can you put your phone into bootloader (power off phone and then turn it back on while holding the vol. down key)?? I'm sure you can since mightyrom is installed.
If so download the sprint factory rom from
http://forum.ppcgeeks.com/cdma-tp2-d...3-19-10-a.html
Sync your phone up to your pc first and then Unzip the files you downloaded using winrar and run the rom update utility.
Or
Download the files, unzip, put your phone into bootloader mode, and then run the rom update utility and then sync
Be sure to select the right carrier.