This is a step by step tutorial on how to back up your DRM keys (TA Partition, to revert to factory state in case of warranty issue) and unlock the bootloader. After unlocking the bootloader you will lose your DRM keys so it's good to make a backup of it (it's optional though). Basically no DRM keys means no warranty and unlocked bootloader means no warranty. Read also here for additional info: http://forum.xda-developers.com/show....php?t=2292598
Make sure to read the 'Questions' (bottom of the post) if you encounter any problems!
First of all you need to have root access to backup your DRM keys.
Follow this thread to get root: http://forum.xda-developers.com/show....php?t=2784900
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