Sony Xperia T3 backup original software and SIM UNLOCK?

Hi friends, I have Sony Xperia T3 and it is on contract for 2 years. My sim is locked and I want to unlock sim. Before unlock I want to backup original software that I don't lose waranty if they need service.

So, Can anyone tell me how to make this, save original software on pc from phone and unlock sim. :D:D

Thanks in advice

Kind Regards!!!

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