[Q] Problems going back to Jellybean firmware with root.

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http://forum.xda-developers.com – I need to go in the opposite direction many guides explaining how to downgrade the firmware to attain root. Got my tablet back from RMA with Jb .16 on it and downgraded, rooted, installed rootkeeper, flash, etc with no problems. Now I can't get back to JB. Everything I'm trying is erasing the root. I'm using stock firmware and still locked device. Should I be waiting for the device to get OTA updates back to JB? Every time I check it says no update. Are there simplified versions of the upgrade firmware that won'tt do clean installs and erase everything? This is basically what I've be (HowTos)