I stood by the bike and watched when dealer updated my 18 with upmap to Evo 2. Like Rick said, the dealer has no control over the process. The computer authenticates, reads the modules and does what it wants. It updated a bunch of modules for me including DES and updated some parts of the ECU but left all fueling intact. I know this for a fact because: a) if upmap was overwritten I would have immediately gotten a CEL as I have no emissions bs b) computer still said race evo on startup and c) butt dyno definitely said bike still ran the same as before (crap because upmap is garbage for early bikes) d) subsequently when Frank updated me to his SLR tune, he asked for a copy of my upmap file that was on the bike and verified it was an upmap.
There is other literature on another ducati forum detailing the same things I am describing. I remember reading it before going through the update process on my bike.
https://ducatimodified.com/threads/...-racing-evo-for-aftermarket-exhaust.57/page-4