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.
This often indicates the bootloader is unlocked. Use the command fastboot oem lock in the ADB terminal to relock it before trying again. This happens if you try to flash an
The keyword refers to an official ROM Upgrade Utility (RUU) for the HTC EVO 3D (GSM) , specifically designed for the Taiwan (Asia-TW) region. Use the command fastboot oem lock in the
Fixing a device that is stuck in a boot loop or won't start. Install the latest HTC USB Drivers or HTC
Install the latest HTC USB Drivers or HTC Sync so your PC can recognize the phone in Fastboot mode.
Running an RUU will completely wipe all data on your phone, including apps, texts, and internal storage. Flashing Procedure
Put the device into Fastboot mode . (Power off, then hold Volume Down + Power . Once in the bootloader menu, select "FASTBOOT" using the power button).