I installed the CM11 and while installing other apps and trying them out I must have broken something because it can't see the usb flash drives and when I install a 3rd party app for that it still can't see what's ON the drives. I need to go back to stock. I've tried the recovery method. I downloaded the factory firmware. Put the update.zip on the internal sdcards dload folder. I put TWRP recovery on it wiped the data, dalvik, cache, factory reset and system. Then rebooted into fastboot bootloader and reinstalled the stock recovery. Then rebooted into recovery. And it locks up with nothing on screen. I've tried it a couple different ways of wiping and a couple of other factory type firmwares. Nothing works that way. How can I restore the factory firmware using the "fastboot flash" method and not the "fastboot update" method?