I have no clue about pretty much anything this thread is about, but I do have one crucial piece of advice that may help out:

If you've accidentally already synced your phone after updating, check your Recycle Bin (if on Windows).  My experience with iTunes is that if it was syncing a newer version from the phone to the PC, the older version was merely recycled rather than deleted entirely.  Delete the "new" version's *.ipa file from "My Music \ iTunes \ Mobile Applications", restore the old version from the Recycle Bin, and send that version back to the phone.