Just tried doing mine but have run into issues, but thing I now know what the problem is.
First of all make sure your USB is formatted to Fat32 and not exFat.
Turn on the car and go to nav and then press the nav button again (at least this what I did).
This should then say "new software found" or something like that anyway.
This is where mine stops as it's asking me for a licence code, the dealer software update removes this code requirement I'm led to believe.
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