Ruu-shooter-u-ics-35-s-htc-asia-tw-3.28.709.3-radio-11.77.3504.00u-11.25.3504.06-m-release-270747-signed.exe May 2026

The utility will verify your current software version and device ID (CID). If compatible, click "Update" and wait for the progress bar to finish. Do not disconnect the cable during this process. Common Troubleshooting

Put the device into Fastboot mode . (Power off, then hold Volume Down + Power . Once in the bootloader menu, select "FASTBOOT" using the power button). The utility will verify your current software version

This often indicates the bootloader is unlocked. Use the command fastboot oem lock in the ADB terminal to relock it before trying again. Common Troubleshooting Put the device into Fastboot mode

Connect your phone to your PC via a high-quality USB cable. This often indicates the bootloader is unlocked

Fixing a device that is stuck in a boot loop or won't start.

This happens if you try to flash an RUU from the wrong region (e.g., trying to flash the Taiwan RUU on a European device). You may need to change your CID to HTC__621 or have S-OFF (Security Off) status to bypass this.

Manually installing a system update when the Over-the-Air (OTA) method fails. Installation Prerequisites