@Tigrou49
I'm not surprised it didn't work. SP 2610 and GW Navis may well be related hardware, but so are a lot of other Garmin units and they still use different fw. As you were looking for a gcd I assume that you were trying to load the SP fw to a GW on the assumption that they are the same unit. That would explain why you didn't want to do it via usb with either the exe or rgn files which GWs are not capable of, but the SP 2610 is. If so, it's just as well your GW unit refused to load the SP fw or it may have bricked. SP 2610 v4.80 is the latest for that unit, but it was released in '06:
The later GW fw eg v4.60 posted in this thread enables the older 06/07/08 (CF card) units to read NT format maps and is available from Garmin only by purchase of the CF card containing the NT enabling fw and an outdated NTNA map:
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