An RUU flash will wipe all user data , including apps, photos, messages, and contacts. Back up everything to your computer or cloud storage.
: Take the microSD card out of your phone before running the update. The RUU tool will fail if it detects an SD card installed.
This is the most straightforward approach and is recommended for standard system restorations and updates. htc android phone rom update utility
If you installed custom ROMs (like LineageOS) or rooted your device and want to revert to the factory software.
In the early era of Android smartphones, Over-The-Air (OTA) updates were often unreliable, slow, or carrier-restricted. To ensure devices could be updated or restored to factory settings, manufacturers relied on PC-tethered flashing tools. For HTC devices—such as the HTC Dream (T-Mobile G1), HTC Hero, and the iconic HTC Evo—the standard tool was the ROM Update Utility (RUU). An RUU flash will wipe all user data
HTC implemented robust security layers to prevent unauthorized flashing, leading to a "cat and mouse" game between HTC and the modding community.
HTC officially removed many RUUs from its download servers after 2018. However, the community has preserved them. The RUU tool will fail if it detects an SD card installed
For most standard RUUs to run, the device's bootloader must be in a "Locked" or "Relocked" state (unless the device has "S-OFF" status). Battery Life:
Disclaimer: The use of RUU tools modifies system software and voids warranties if the device is still under support. Users proceed at their own risk.
Unlike minor Over-The-Air (OTA) updates that only patch specific parts of the system, an RUU completely overwrites the phone’s existing software. It replaces the system, boot, recovery, and user data partitions with a clean, factory-fresh installation. Key Purposes of an RUU
This happens if you try to flash an RUU that does not match your phone's specific CID or MID. Double-check your fastboot getvar all data and find the correct file.