First off, wrong section, and this will be moved.
Enter the bootloader and then flash to your sprint stock like normal - it'll work without selecting anything else. After you flash to your sprint rom, hard reset and then flash to another ROM of your choice.
To enter bootloader on the Diamond : Hold VOLUME DOWN + POWER and, using the stylus, press the RESET button under the back cover on the bottom right of the phone.
Enjoy
