
1. Check your device model - This guide is for HTC Desire Eye and its variants including AT&T Model and International Unlocked Model only.
2. Backup - Backup is mandatory since bootloader unlock will erase your device to factory.
Requirentments- First you should have bootloader unlocked device. (Please visit "http://www.htcdev.com/bootloader" to unlock your bootloader)
Installed ADB Drivers and files - tool can found here, link - https://drive.google.com/file/d/0B9SWmcUAdoOnOVpITTVtcFZUZUk/view?usp=sharing
Download your recovery.img here, link - https://drive.google.com/file/d/0B9SWmcUAdoOnc3hOLXpWVVFIc2c/view?usp=sharing
Super SU & binary here, link - http://download.chainfire.eu/593/SuperSU/BETA-SuperSU-v2.19.zip?retrieve_file=1
Put recovery.img to your ADB folder in PC, and super su to your mobile.
3. Now start command line in the ADB folder where your files located in the PC (Right click + hold down Shift) then "Open command window here"
Guide - http://www.tech-recipes.com/rx/232/right-click-to-open-a-command-prompt/
4. Run following commands to flash recovery.img to your device ( this will replace your original recovery)
fastboot flash recovery recovery.img
Simple.. Now reboot into recovery by pressing power+vol down, then select recovery in the loading screen (if you have any issues rebooting into loader screen please try after disable quick boot in power settings).
5. Now flash your Super SU (Zip) transferred to your mobile by selecting in the recovery.
Everything good to go after reboot.....!!!!
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