Question samsung update

Jul 16, 2019
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hey there
recently i bought a used s9 plus which is snapdragon variant,
i m in lebanon and the device is registered in UAE,
it runs andoid 8.0
i signed into google account and samsung account
when i try to update it manually it show a registration of device the after several minutes it failed
i tray for several times,it refuse immediately and give me failed operation
any help please?
or any idea about what happened?

thank you