Question regarding Region Lock

My relative bought an s7 edge for me from Saudi Arabia (I live in India). When I opened the box, the seal said it's locked to Middle East sim cards and I was not aware of that. I then found out that you have to place a 5 min call using a local sim or you could give it to a service centre to get it unlocked. But since it had a defect (Black spot on screen), I gave it to my relative to get it repaired back in Saudi Arabia and also to get the call placed.

He'll be back next week. But my question is, if I ever want to do a factory reset, will I have to place the 5 min call again? I searched the internet for hours but could not get a definite answer. Also do I have to do the same if I flash another country's firmware?

Thanks in Advance

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