I've looked everywhere for a solution but couldn't find one that helped. I was trying to flash a mod via TWRP custom recovery (followed all the instructions, wiped dalvik cache etc) but when rebooting, |the phone got stuck on the HTC One logo. I can access the custom recovery but when trying to mount storage, computer -running Windows 8- doesn't seem to do anything. Also made the mistake of not making a nandroid backup beforehand, so just need to be able to flash a ROM. Tried to adb push the file, but it gives me the error 'device not found'.