I originally lost my first 60csx back in 2008 and purchased a direct replacement in 2008. I have TOPOGB v2 from the same era and back then a phonecall to Garmin allowed me to load the maps onto my replacement unit
After starting up the 60csx (it has been lying in a drawer for years) I noticed there was no memory card so I inserted a blank and tried to download the TOPOGBv2 onto it but unit says it cant unlock maps, annoyingly Garmin dont support the unit no more so couldnt help me.
Strange one as same software and hardware paired up back in the day!!!!