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@Backstop
It doesn't mean it was always up, it means it is now up, prior to the measurement the system only has a probability of being up or down, the Copenhagen interpretation says it is both up and down prior to measurement.
Apsect's work on Bell's paradox showed this to some extent though the results are not felt to be conclusive these days.
Though I agree no information has been passed from A to B, relativity still holds there. they are 'proving Einstein wrong' in the sense that the collapse of the wavefunction after measurement is instantaneous.