Method from Caty mentioned above is not possible for you device!
Use Garmin firmware downloader/reconstructor
[Only registered and activated users can see links. ]
Usage: gda.exe [<original.rgn> <result.rgn>]
<original.rgn> - name of software RGN file from Garmin.com (download it and put in folder with gda.exe)
<result.rgn> - your name for new file that you get from device
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