CyanogenMod one of the most famous custom rom makers now have hit Xperia Z Ultra “Togari”, yes CyanogenMod 10.2 Nightlies are now available for download on their website. Xperia Z Ultra currently on android 4.2.2 jelly bean 14.1.B.2.257 firmware and android 4.3 is next in line. Sony has already confirmed that soon whole Xperia Z family will be updated to android 4.3 jelly bean.
CyanogenMod 10.2 Nightlies bring android 4.3 jelly bean to Xperia Z Ultra. Download the CyanogenMod 10.2 Nightlies package for Xperia Z Ultra from the official CyanogenMod page. It is still unstable release, so there must be a lot bugs in this.
Download CyanogenMod 10.2 Nightlies for Xperia Z Ultra
Download Gapps Package
Back up all your data on Xperia Z Ultra, unlock your bootloader and then install the CyanogenMod 10.2 Nightlies package for Xperia Z Ultra and then flash the Google GApps package, to access the Google services.
If you want to have a stable ROM then wait for another CyanogenMod 10.2 release for Xperia Z Ultra or wait for official android 4.3 release for Xperia Z Ultra.
If you have updated to above then let us know your comments…[ Source – CyanogenMod ]