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Postagem original de: phonesurgeon ,

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Check your date and time.

This happens a lot when disconnecting the battery for an extended period of time. Sometimes connecting to a WiFi network will re-sync the time, but if it doesn't you can change it manually. I think they default back to January 1st 1973 or something like that and due to iOS being the OS that it is, changing it forward 42 years (month by month on the dials) isn't quick, but it works

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