Download and install the following before starting the Unlock Bootloader
Google Android SDK zip:DownloadJava Runtime Environment:
DownloadHTC Sync (Windows Only):
Download1. Go to
http://www.htcdev.com2. Select Unlock
Bootloader3. Click Get Started
4. In the drop down menu select "
All other supported model"
5. Follow the instructions in next page and till to the end.
6. Once you unlocked the bootloader your warranty will be void.