HTC One Google Play Edition: How to Unlock Bootloader/Root/Install TWRP

Google recently released Android 4.4.2 KitKat software update with build number KOT49H for the HTC One Google Play Edition device. Those  who have already updated their devices to the latest iteration of Android software and are currently looking for a root method may follow our guide. The tutorial also unlocks the bootloader and installs TWRP custom recovery.