Can't flash ROM, fastboot won't work
So I was playing around with my phone and screwed up..
I was having problems with CyanogenMod, where the keyboard would crash every time, so I tried installing different versions of it, to see if it would fix it. When nothing worked I wiped the system using TWRP. Then, when I tried to flash cyanogenmod10.1.2 NIGHTLY the message I got was "Failed
What do I do? I can't flash the factory rom, because my USB debugged was switched off, so fastboot won't work, and I can't install the only ROM on my sd, because it keeps failing.