How to remove iPhone demo loop?

I have an iPhone XS that has the retail mode/demo loop turned on. Does anybody how to disable it?

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Chances are you bought phone from a third party seller

That would depend on if the device has an Apple account on it or has FMI fuctions is not enabled, demo mode is a specific firmware and needs to be restored to official public firmware.

You can try entering DFU mode - and then restore using iTunes

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