Press Menu on '''your''' remote control, choose Support and then change '''the''' Use '''Mode''' from Store '''Demo''' to Home Use. Second way is by pressing Tools button on '''the''' remote control and then choose Store '''Demo Off'''option. Press Tools button again to check whether it has already changed to Home Use. Good luck
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=== Update (03/05/2020) ===
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Why is it in retail mode? Did you steal it? What phone carrier are you using? Take it to them and they can take the retail mode off. Typically phones are only in retail / demo mode while in a store. Not to be sold like that. It needs to be unlocked. Good luck
Press Menu on '''your''' remote control, choose Support and then change '''the''' Use '''Mode''' from Store '''Demo''' to Home Use. Second way is by pressing Tools button on '''the''' remote control and then choose Store '''Demo Off'''option. Press Tools button again to check whether it has already changed to Home Use. Good luck