You will need some tools like a hammer and an anvil Android Debug Bridge, or ADB that will support backup and restoration of Android 4.0 or higher. You will also need 1GB of free space on your HTC DROID DNA to make this work. Click on the sourcelink for the instructions and make sure you handset is either plugged in or has more than 50% of battery life remaining.
For those new to the process, unlocking the bootloader allows you to root your phone and install custom ROMs. If you have never done this before, think twice because the warranty on your HTC DROID DNA will disappear faster than the New York Jets' playoff chances. And you could end up bricking your phone, for which we have no new metaphor.