Here's my story... I unlocked my Focus to get the update and homebrew apps likes TVShows7. So I upgraded to NoDO and retained the unlocked Focus and apps like TVShows, Samsung Tools, Registry Editor. Recently, I felt my keyboard had been acting up and wanted to wipe by device... so I wiped and lost the unlock and xaps could not be installed manually.
I searched and found a thread on xda that shows simple steps in order to get everything back. I saw everyone was saying, once updated, you can not go back, so wanted to let y'all know that it is possible to go back.
connect to Zune
There you will have the option to restore... select that.
I am actually still on NoDo (unbranded) because I went from unbranded NoDo to AT&T branded NoDo.