An RUU is an official executable file (.exe) released by HTC. It contains a complete system image, boot, recovery, and radio firmware. When you run it, it completely wipes your phone and reinstalls the factory software.
: Run the downloaded RUU file on your PC and follow the on-screen wizard instructions. Completion htc android phone rom update utility
This is the most common method for official updates provided by HTC or carriers like AT&T and Sprint. : Ensure your phone has at least 80% battery . An RUU is an official executable file (