Your iPhone was hacked/modified/jailbroken to allow its use
in Turkey. When you updated the iOS version, the iPhone was
relocked to the original wireless carrier.
You must contact that original wireless carrier to see if they offer
unlocking and if you qualify. Only the wireless carrier that the iPhone
is locked to can unlock it.
Be advised that the jailbreak/hack has 2 effects - the warranty is
voided and you cannot get help/support here or from Apple, and
a legitimate unlock may not complete due to the modifications made
to the iPhone.
Google may provide some direction, but you also may be the owner
of anuseable and unrestoreable iPhone.
All of this was covered in the 2 month old thread that you jumped onto
the end of instead of starting a new thread with your own question.