@Tigrou49
This is Honda GW fw thread, so it's not really the place for that request for StreetPilot fw but you can dl the v4.80 exe file from Garmin:
Code:
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Instruction for installing the fw using the .exe are included at the base of that page.

If you really want it as a GUPDATE.GCD, you can make it yourself. Extract the StreetPilot2610_480.exe file with 7Zip, then convert the 021001000480.rgn file using RGN_Tool and rename the resultant 021001000480.gcd to gupdate.gcd. [Only registered and activated users can see links. ].

Here's one I prepared earlier: [Only registered and activated users can see links. ]. Use at your own risk though