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Re: Garmin StreetPilot 33o
Did you try to upgrade your Garmin with 2008 maps? If you have the map registration code then you will have to go to garmin's website and get an unlock code. You will need the registration code and also the unit serial number before you can get a new unlock code. The unlock code is base upon your unit serial number and will only work with that unit.
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The "Can't Unlock Maps" message occurs when the device detects that maps have been installed, either to the internal memory or on an SD card, that do not have the proper unlock code required by Garmin. It sounds as if what you may have done is inserted an SD card with maps on it that are not unlocked for your unit. Call Garmin; they will sell you the proper unlock code for using the maps in your unit.
When updating the maps, you need to be registered with Garmin. All the numbers came with the unit. If you turn over your Garmin 2720, there will be a number flanked by "*". That is your unit ID. When you register, you must provide that ID. From the site, you can update your maps and you shouldn't need the 25digit key. It's programmed into your unit.
You will need to purchase Mapsource NT 2008 to get the latest maps. The upgrade will come with a serial number which you will use to register on garmin's website. You will also need your unit ID, it can be found on the back of your unit, when you register with Garmin. Afterward you will get your unlock code (25 characters). You will enter the unlock code in Mapsource before installing the maps onto your Garmin.