: Power off the phone, hold the "boot key" (usually Volume Down or Volume Up ), and connect it to the PC via USB.

: Run the executable (e.g., UpgradeDownload.exe ) and click the Load Packet (gear icon) to select your .pac file. Start Process : Click the Start Download (play icon) button.

: For advanced users needing partition-level control.

: Recovers "dead" or unresponsive phones where standard software updates have failed.

: The specific stock ROM file matching your device model to prevent permanent damage (bricking).