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If the process fails, the utility will usually display a specific error code:

Complete Guide to the HTC Android Phone ROM Update Utility (RUU)

If your phone is stuck in a boot loop, won't turn on, or has a corrupted operating system, an RUU can often restore it to working order 1.2.3 .

: Your phone should have at least 30% to 50% charge . If the device loses power during the flash, it may become permanently inoperable.

There are two primary ways to use the RUU: the .exe method (easiest) and the .zip method (via SD card). Method 1: Using the RUU.exe (Windows PC)

Fix: Relock your bootloader via the command prompt ( fastboot oem lock ) before running the RUU executable.

If the update fails, the RUU is designed to provide error codes and recovery measures. HTC Support | Updates

Use a high-quality, original OEM USB cable. Connect to a rear motherboard port if using a desktop PC. How to Find Your HTC Phone's CID and MID

Fixes software crashes, bootloops, and soft-bricks caused by failed rooting attempts or corrupt system files.