Hi. FRP (Factory Reset Protection) must have been activated on the Power Tab in question. This is a new Anti-Theft or theft deterrent feature found in Android Lollipop devices. If you are looping on the Google login, then the likely cause is that the Gmail credentials you are entering are either not correct or do not belong to the account that was Primary on the tablet. At this stage, only Vodacom (at one of their Vodashops) will be able to assist clearing the triggered FRP unfortunately.
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