there are checkbox options to a) backup data which is then restored b) erase all data before upgrading and c) erase all installed applications.
as these options are available within app loader, you can either have it backup and restore data and just install the os, or have it backup and restore all data AND have it erase everything THEN load the OS.
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~Midnight Draven
"That's it then. Cancel the kitchen scraps for lepers and orphans, no more merciful beheadings... and call off Christmas."
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