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When you say "stock" are you talking about a previous version or just back to new status. You can go back to stock in settings - backup and reset, reset. That will wipe data and non stock apps.
What I am trying to do is recover my tablet so I can have it useful again, and as I have this trouble with storage I guess I need to get back to official firmwareI have no clue what you are trying to do, if you want to flash jb rom, flash jb recovery then flash jb rom, same goes for ics. You can flash I think 6 different roms.