Good day. I have a problem is a procedure to change the firmware? I have 5,0,1 but with our SIM only works 5,0,0

good day. I have a problem is a procedure to change the firmware? I have 5,0,1 but with our SIM only works 5,0,0

onix_76 wrote:
how come? Documents also have on hand to buy as photo and check the box
So what?  The second-hand shop you bought it from didn't follow the right procedures.  You also didn't follow the right procedures to make sure that iPhone was not in Activation Lock.  It's like buying a car for cash but not getting the title signed over to you.  It's not your car if you don' have the title.  And that's not legally your iPhone if the previous owner's Apple ID is still registered to the device for Find My iPhone/Activation Lock.
Only a proof of purchase from the ORIGINAL retail store would do any good at all.  Return the device to where you bought it and demand your money back.  If they refuse, either get a lawyer and/or turn in the device to local police.  If you're in possession of stolen property, then the cops won't care about where you got it from.

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