If you look in the original development thread you will find it. Go to the website download the one for the DNA and then follow the guide. Once you achieve soff you need to flash a custom recovery. I recommend the twrp 2.6 beta it seems to work when flashing all the kit Kat roms I haven't tried 2.7 yet but if your feeling adventurous you can try that to. To flash a recovery you need to put your phone in fastboot and then use the command fastboot flash recovery and then you have your recovery on your phone. Then you can flash what you want. If you want to do this and need any help direct message me and I can help you out.
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