Replaces critical partitions, including System , Boot , and Recovery , and may also update the radio image.
: The phone will reboot several times; do not disconnect it until the wizard says "Finish". Method 2: Using the SD Card (.zip) : Find the specific RUU file for your model and Carrier ID (CID) htc android phone rom update utility
If an HTC device enters a "boot loop" (failure to load the OS) or has corrupted system partitions due to failed rooting attempts, the RUU is the definitive method to restore the device to a factory state. It completely wipes and rewrites the system partition. Replaces critical partitions, including System , Boot ,
It is the digital defibrillator for a dying HTC; the undo button for a bad flash; the time machine back to stock Sense UI. If you own an HTC Desire, EVO, One, or Butterfly, downloading the correct RUU and learning to use it is a rite of passage. It completely wipes and rewrites the system partition