I connected to itunes on my computer to and i updated my iphone and now the SIM is not recognised so I can only make emergency calls

iTunes offered to update my old iphone to version 3. something and now the phone doesn't work because it says the SIM is incompatible.
This is the sane SIM that was working fine before the update.
I even uploaded some photos.
How can i get back the old version of iphone software so that it accepts my SIM

The original owner has a new iphone and he gave me this one. All we did was put my SIM card in and it worked; I'm sure he didn't have to hack it to unlock it. He just had this old phone lying around.
How can he authorise unlocking it if he doesn't have the same SIM anymore -he'smoved countries a few times.

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