Meaning: The tool cannot flash the software due to a security mismatch, often because your bootloader is unlocked or you are trying to downgrade firmware on an device.

Copy the renamed zip file directly to the root directory of the microSD card (not inside any folders). Insert the card into your phone. Boot the phone into (or Bootloader Mode).

The is a official Windows-based executable used to manually install or restore the factory stock firmware (ROM) on HTC Android devices. It is a powerful tool for unbricking a device, unrooting it, or simply returning it to its "out-of-the-box" state. 1. Critical Preparation & Requirements