[lkillen]

Place the file on your SDCard. Shut down the phone. Go into Bootloader and from there go into Recovery. From Recovery selct Wipe. Within that menu select Cache and Dalvik and wipe both of them twice. Then retunn up one level and select UpdateFromZip file (words to that effect).
Locate the file you want to flash and flash.
If after doing this, you are still having problems, go to HTC and download RUU_SuperSonic_S_Sprint_WWE_3.70.651.1_Radio_2.15. 00.11.19_NV_1.90_release_161482_signed and run it from your computer and follow the instructions.