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The Garmin C550 does not come with a PIN number set. It comes "unlocked" and you have the option of setting a PIN number, if you choose to. There is no paperwork that came with the unit telling you the PIN number. If you purchased this unit used, you can ask the previous owner if they remember the PIN. Otherwise, your options are to bring the unit back to the location at which the PIN was entered where it will automatically unlock, or send the unit back to Garmin.
There is no easy solution for this except to return your unit to the nearest Garmin outlet. You need to have very special equipment called an E-Prom burner or writer which only Garmin have. With this equipment they re-programmed (restore) the operating system back on your specific Garmin unit and model.
The problem why anybody can't do it is because there is no way you can access your Garmin unit from a pc or mac if the operating system is lost or damage on your Garmin, for the simple reason your pc or mac can't reconize the device that is pluged in, because there are no communication platform between the two devices.
As simple as that, life with it or send your Garmin gps to an autherized professional Garmin dealer.
Erro 12007 means ERROR_INTERNET_NAME_NOT_RESOLVED
This means that you do not have any dns server names wher it can look up the ip adres of the garmin server you want to connect to. Do you have internet? Or are you on a dial up line where you have to dial-up to pick up your mail?
Garmin software will only work with Garmin hardware. Garmin does not use the standard NEMA protocol for GPS output, but their own. Also their software is tied to their hardware by a unit id, which require an unlock code in order for the maps to function.