Have you checked that Mrs '99 hasn't gone to Brazil?
She is sat across from me at the moment! But I suppose I have not checked if she has gone Brazillian.
Sorry, I should have asked what you mean when you say, the tablet “thinks it’s in Brazil”. Do you mean that your location on the map app shows you as being in Brazil or do you mean that the adverts that pop are in Portuguese and are for goods and services located in Brazil? Or both?