Reboot the device to bootloader by holding Volume Down and Power buttons. Connect the HTC device to PC and copy the renamed ROM zip to root. To flash stock firmware ROM on HTC device using bootloader: Copy the ROM zip file and rename it to appropriate update build. Right-click anywhere inside explorer window and choose Sort by then select Date. If you are using the newer version of Windows press Windows key and R. Paste the following on your Windows Explorer navigation barĬ:Documents and Settings%USERNAME%Local SettingsTemp. To manually collect firmware update zip from RUU: If both recovery do not work then you need to flash the file using Fastboot command. In case the RUU.exe does not work then you should manually collect the ROM zip, rename it and then flash it using stock or custom recovery. Your device will now be updated to the latest firmware version. Now, follow onscreen instructions to complete the update process Double-click on RUU file to begin the process. Find and download RUU for your HTC device and connect the device to PC using USB cable. To update HTC Android smartphone via RUU: Install Android SDK and ensure the bootloader is unlocked. Make sure the USB driver is installed in your PC. 
Ensure the device has a minimum 80 percent battery charge. 
IBTimes UK reminds its readers it will not be held responsible for any damage to the device during installation. Those looking to update your HTC device with RUU may check this tutorial. Samsung Kies is the recommended process to update your HTC device, but if due to some reason you are unable to do so then you can proceed with the manual installation by using RUU.
ROM Update Utility (RUU) lets users to update their Android based HTC devices manually.
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