Original Firmware and How to topic

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Hi,
I've bought a used Xperia Z Ultra, that was rooted with dirty unicorn.
Found that the call function wasn;t working properly (screen went off when making/receiving calls)
Decided to flash the original official firmware, but not very sure what are the steps. And also having difficulties finding the US firmware.
Can someone please enlighten me?
Thanks a bunch in advance.




xda-developers


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