oh and to help you out
you can flash a ROM from internal storage. (no activesync required)
backup anything you want saved from your Device Storage, this will not delete anything on internal storage.
1) first download the stock sprint rom from
here
2) plug your phone in "hard drive mode"
3) extract the RAR file you downloaded, and save the .NBH file to the root directory of your internal storage
4) rename the NBH file DIAMIMG.NBH
5) turn your phone off
6) turn on your phone in bootload mode - Power + VolumeDown + Back holding till it reaches the color bars screen
7) It will tell you to press power to start the update, do so.
when it reaches 100 percent and is done push reset button or pull the battery out. Then put battery back in or wait for phone to reset, it will start up with stock