Default [Q] Upgrade Samsung Galaxy mega 6.3 GT-I9200 to kitkat 4.4.2 for Egypt

Hi,
I want ur help to upgrade my device Android OS to 4.4.2 KitKat
I found many threads that talk about that, but I don't know how to select the right baseband number and i don't want to make it damaged.
So, I want help with the right firmware suitable to my device and my location due to network and wifi problems.
here's some info about my device:
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thanks