Quote:
Originally Posted by kranu
Anyways, the bottom line is: If you already have all the hacks installed, go ahead and update. There's nothing bad about the update, and it adds a few nice things (though it leaves a lot to be desired).
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No. 3.1 fixes the update mechanism and will ignore the signing key used by the hacks. This means you can't install or uninstall any hacks if you're on 3.1. Existing hacks will still be present and may or may not work depending on what they've modified/added to.
If you've got USB networking installed already then you can manually go in and alter files to restore the jailbreak however but this is not something I would recommend for anybody that doesn't know precisely what they're doing.