I do know about i phone i bught from sombody that time was working in kenya when i updated the phone showing lock how to short out this promblam.
Only the original provider can unlock the phone. You'll have to contact the provider, give them all the info like serial number etc, and if supported by the provider, they will unlock the phone.
To find out if the original provider supports unlocking, have a look at this article:
Locating iPhone wireless carriers
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