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Trying to return TB to stock, cannot connect to PC without a reboot loop
I recently switched to a new HTC 8X and took my Thunderbolt off my account. However, I would like to give it to a friend of mine who needs a working phone. I had rooted with Revolutionary, and I would like to restore it to stock and wipe my data. However, whenever I plug the TB into my PC, I get a message in Windows that the USB device malfunctioned, and then the phone goes into a reboot loop. The only way I can get the phone to boot is to pull the battery, put it back in and then hold UP on the volume while hitting the power button. I have been able to get into the bootloader and tried a factory reset but the phone just goes into the reboot loop. I also tried the factory reset from the settings menu, with the same result. I should mention that I am running Windows 8 on my PC, so perhaps that explains why the PC isn't recognizing the phone?
Any help or suggestions anyone has would be very much appreciated.