mobile

I have a strange problem with my One running CM12. The bottom 1/4 of the screen is not detecting touch. so I can't use the navigation buttons or a little above it. Nothing has happened physically to the phone so I was thinking (hoping) it was a software issue. I figured it's the perfect time to put Oxygen on it but when I boot into TWRP I still can't access the bottom of the screen to swipe the flash (hoping that it's software diminishes).

As a last ditch effort I wanted to flash it from the PC but I can't find any tutorials that take me step by step. I copied the ROM over to the device (no SD card) and can boot into Fastboot mode but I'm not sure how to flash the image.