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Root installing other country's firmware on note4 910c

i am from Pakistan and here the latest update for note 4 910c is android 5.0.1. i want to install 5.1.1
my question is, can i install any 910c firmware of other country from sammobile? should 4g work after flashing? if yes then which country's firmware i should install. my phone is fully unlocked. thanks.
 

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