I got my brother's old HTC One M7 and tried to flash the ROM.
I have experience with Samsung Devices so I figured it worked the same way.
I install cyanogenmod using their installer. It worked, but dreadfully slow (slower than the stock rom).
So I downloaded Android Revolution 53.0, put in the /Downloads folder and went into recover and tried to install from zip.
It appeared as if the installation went through, and now the phone is stuck on the HTC quietly brilliant screen.
I can go into HBOOT, FASTBOOT, RECOVERY.. But I can't seem to get past it.
Just went into recovery and see "No OS installed! Are you sure you wish to reboot?"