Try connecting your GPS to your computer and go into the Garmin folder. Inside that is the GPX folder, and in there are all the .gpx files that hold your track and waypoints that you've saved. If there's no files in there, then you're probably out of luck. If there's files in there, copy the WHOLE folder to your PC, then delete the GPX folder from your GPS. Unplug your GPS from the PC, turn the GPS off, then plug it back in and turn it back on. Copy the GPX folder you just saved to your PC, back into the Garmin folder on your GPS. Unplug, turn off your GPS, then turn it on (remaining unplugged), and see if your waypoints reappear.
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