PTCRB certified a new firmware update for the Sony Xperia T2 Ultra Dual.
The new firmware has the build version 19.1.1.C.0.56 which will level up the smartphone from 19.1.C.0.116 firmware.
According to Xperia Blog, the recently certified firmware is compatible with Xperia T2 Ultra Dual D5322 and XM50h variants.
Once a certified firmware for Sony Xperia T2 Ultra Dual is approved for rollout the users of this device may expect the update in a couple of weeks.
When the 19.1.1.C.0.56 firmware is released via OTA, and your device is eligible to be updated to a new version of Android firmware normally you should receive an automatic message from the system in the notification panel.
Sometimes the system fails to prompt users about a new downloadable update so you can check from time to time if an update is ready for you by going to Settings >> About phone >> Software updates >> System updates.
The certification for the single SIM model of Xperia T2 Ultra has not been posted yet, and it is expected to follow later on.Currently, the Xperia T2 Ultra is running under the 19.1.A.0.473 firmware version of Android 4.4.2 KitKat.