how to roll back from kit kat to jelly bean

I have a Nexus 7 2012 wifi version that I have updated to kit kat. I decided to root it but there's no way, believe me I've spent a lot of time on it. No driver available (or at least nothing works). I need to roll it back to jelly bean, then I should be able to get the correct driver and root it.
So here's the 64 thousand dollar question:
How can I take a device that's already been updated to kit kat and install jelly bean on it?

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