When it comes to making appealing hardware, Sony makes some of the best-looking phones out there. Take their mammoth-size Xperia Z Ultra for instance that features a 6.4 inch display. However, users have not been very pleased with Sony’s custom user interface. If you like to run something close to AOSP, the impeccable CyanogenMod team is now offering nightly builds of CM 10.2. The download size is just 217 megabytes.
Sony usually leaves their bootloaders unlocked, so it was not very difficult to get the CM10.2 working on it. All you need is custom recovery on it, and you should be good to go. However, keep in mind that nightly builds are not meant for the faint of heart, and we strongly urge you to make a backup before proceeding.
If you are ready to make the move, just download the single file from get.cm. After you are done flashing the ROM, make sure to flash the gapps package if you want access to playstore.