We've talked about how to flash an image using ROM Manager, but if you're more comfortable with a keyboard and mouse, fastboot might be easier for you to use.

Want to flash a custom ROM on your phone or perform other actions using the fastboot tool? Then you’ll need to plug your phone into a computer with a USB cable… for now. But Android Police ...

Copy the ROM zip file and rename it to appropriate update build To flash stock firmware ROM on HTC device using bootloader: ...