Sprint HTC Touch Pro 2 in reboot loop

[DogMom]

We recently purchased a Sprint HTC Touch Pro 2 phone from Ebay. I accessed the Bootloader mode to see if the device was locked and now the device is in a constant reboot loop. We have tried a soft and hard reset and now the device will get to the Windows loading screen and then reboot all over again.

I can enter Bootloader mode without any problem. I have searched through the forums and found the procedures for flashing the ROM in bootloader mode but the problem still persists. The flashing shows 100% complete and the device reboots, but then it goes right back in to the reboot loop. I have to remove the battery for several minutes to get the device to shut off completely.
Can anyone provide some guidance on how we can get this fixed? Do I need to unlock the device before flashing the ROM? Can someone provide me with the links to the downloads I need?

Any help would be greatly appreciated!