HTC has delivered a brilliant device in the form of HTC One. It is a fine device that will deliver you with great performance, and an innovative User Experience. However, many of us will still want to do some experimentation with the device in spite of a brilliant UI provided by HTC in the form of Sense 5.0. To be able to change custom ROMs, flash new kernels, etc you’ll have to Unlock the bootloader of your device (Developer Unlock). Luckily there exists an official method to Unlock your device.