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Yea, and I am still stuck on the 4.4.2 (14.3.A.0.757) on model# C6833! are you listening SONY?
I still did not receive the 4.4.4 kitkat update till date fro my Z Ultra C6802,I am from India.Did any of Z Ultra users from India get the update
Just like any other update, you have to either
1. wait for the update to be approved and released in your country
or
2. manually update/flash your phone with flashtool
you can also contact your local Xperia Care
You can manually flash another country's firmware however before generic handsets get the update the networks have to all authorise the update, I'm not saying they have to release the update but they do have to authorise it - Then Sony will be authorised to release it to generic devices