The answer to this question is available in the FAQ: How do I downgrade the OS on my BlackBerry? - BlackBerryFAQ
Cheers,
--Phil
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Phil
Emergency Medical & Disaster Response
BlackBerry PlayBook 64GB, 9900, 9810, 9800, 9780, 9700, 9000, 8310, 8220, 8700R, 8100, 8300, 7290
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