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I recently let my Samsung Galaxy Tab 2 tablet do a system update to Jelly Bean.

I despise Jelly Bean and want to restore back to the factory ROM - Ice Cream Sandwich.

How do I restore it back?

I already did the factory data reset but that has nothing to do with the system update.

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You will have to find an Odin package of the previous firmware and flash it via Odin. That will void your warranty and wipe your device. You definitely have the 7" tablet and not the 10"? The specific model will help (should be in Settings->About). –  Matthew Read Feb 13 '13 at 19:43
    
@MatthewRead Sure that voids the warranty, even with an official firmware? Isn't that just like "never applied the update"? Besides: Here in EU it does not void the warrantee, even rooting does not. There is an EU law that warrants warranty (uh, what combination)... –  Izzy Feb 13 '13 at 19:47
    
@Izzy Yep. Samsung has a flash counter saved in ROM specifically so that they can tell if you've done it, and honestly I don't blame them -- Odin is much more powerful and dangerous than rooting. –  Matthew Read Feb 13 '13 at 19:51
    
AFAIK that flash counter is not always triggered (e.g. not when you update with an official FW update), but I never checked (never had a Samsung phone). So I thought it would neither be triggered when flashing any other official version. But as said, I cannot tell. –  Izzy Feb 13 '13 at 20:22
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