Thank you very much for your answers…
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the tablet I bought was not new, but used, so I guess the 7 days period was not necessary.
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the model I bought is, according to the information given by the seller: SM-P610NZAADBT
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the models on the Know your hardware - Samsung websites start with SMP610X… and not like mine which is SMP610N (German edition)… and I don’t understand this difference.
Again thank you very much for any help