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When you open WinKFP select Comfort Mode then Update ZUSB (Not Choose ZB or Enter ZB). Select the ECU family only, enter the VIN, OK, then Done, then Prog.ZB Update. When you do that it will tell you the old version and then the new version (which might be the same if there's nothing newer)
I think that's the right steps and buttons. There are numerous guides on a basic update.
You only tell it the ECU type normally but you can select a specific ZB for the ECU if you want. It then interrogates it and finds out what to upgrade to based on the history files and possibly others.
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