I'm selling my Garmin Forerunner 620 on ebay and was wondering if I just have clear my run history before I sell it or do I need to do a factory reset?
I would do a factory reset. Just to make sure any personally identifiable info is gone. Also, as a courtesy to the buyer, clears up any potential issues or personal settings you might have had on it. When the buyer turns it on the first time, they'll be greated with the setup wizard so they can set it up the way it should be for them.