Once complete, the Windows utility will display a success message, and your phone will reboot automatically into standard Android 4.0.3 Ice Cream Sandwich. Note that the initial boot up after a fresh flash can take up to 10 minutes to initialize. Troubleshooting Common RUU Failures
An RUU is the master reset tool for an HTC phone. Running it will restore your device to the exact same state it was when it left the factory. It completely overwrites the phone's internal storage, wiping all user data, apps, settings, and any modifications.
: The device must match the Taiwanese carrier ID (HTC__621) or have its bootloader set to SuperCID (11111111) . Attempting to flash this on a US Sprint model or a European GSM model will result in a signature verification error. Once complete, the Windows utility will display a
In the modern vintage tech landscape, an RUU file serves two primary functions: emergency repair and reverting a device back to factory stock. 1. Unbricking and Emergency Recovery
Indicates the file is digitally signed by HTC, meaning it can be flashed onto devices with a locked bootloader (S-ON), provided the region matches. Key Features of this Update Running it will restore your device to the
This will wipe all data on the phone.
Flashing this RUU installs a specific combination of legacy software components onto the device: Android 4.0.3 (Ice Cream Sandwich) User Interface HTC Sense 3.6 Device Compatibility HTC EVO 3D GSM (PG86100 / X515m) Target Region Taiwan (CID: HTC__621) Radio Firmware 11.77.3504.00U_11.25.3504.06_M Kernel Version 3.0.x Linux Kernel Share public link Attempting to flash this on a US Sprint
This particular file brings the Taiwanese variant of the HTC EVO 3D to the final official Android Ice Cream Sandwich (ICS) build. Why is This File Necessary? This RUU is essential for users looking to:
This comprehensive technical guide breaks down the anatomy of this specific firmware file, what each component of the filename means, and how to safely flash it to restore or unbrick your legacy device. Deconstructing the Firmware Filename
: Over years of use, old Android devices can become sluggish. Flashing a fresh RUU can significantly improve performance on the dual-core 1.2GHz Snapdragon processor. Preparation Checklist
An automated installer for Windows that flashes the firmware, bootloader (HBOOT), and radio directly to the device via USB.