Could be tomorrow, next week, next month or next year.
All are equally probable.
There's no real way of determining the time it takes for an unknown number of people looking for an unknown flaw that may or may not exist and may or may not be exploitable in the way that would allow a downgrader to be made.
Just dont update any further (most updates are mainly 'strengthening security'), wait and hope
Or if its new, try taking it back and saying it has dead pixels or the d-pad randomly doesn't work properly or some BS like that to get a replacement.
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