Post [Q] Help Htc One stuck on HTC white screen.(Bricked)

I tried rooting my brothers phone (htc one) and I got an error when I tried to flash a cyanogenmod rom. I found a video on youtube that told me to edit something in it which i proceeded to do. Then i rebooted. The phone was black and i could only get into recovery mode. It wouldn't turn on. So then I cleared some stuff and not there are like no options in recovery mode. All that is on the screen is a white screen with the HTC letters. Please help!!!!!!!!