We have some good news for Sony Xperia Z Ultra owners, you have a build of CyanogenMod 10.1 to play with. Of course you need to have an unlocked bootloader, you can unlock the bootloader on your Xperia Z Ultra from Sony’s website.
The only issue with the build is with the led’s, everything else is working fine. Please note that this build will not be updated as CyanogenMod 10.1 code is now frozen but you can expect CyanogenMod 10.2 builds which is one better than CyanogenMod 10.1.
For installation instructions and download links head over to the original thread at xda.