Power the device on but do not plug it in yet.Eject the device from the Mac and then unplug it.Leave the ones here that still need to be uploaded. Send all the already uploaded files to the Trash.Back up one folder and open 'Activities'.Send these files to the Trash if they are here: GUPDATE.GCD, GarminDevice.xml.With the Edge 500 connected to the Mac, open the 'GARMIN' drive.I also verified with an Edge 500 using Garmin Express version 4.1.18.0 that is does work 100% on the Mac. It isn't the device's firmware because that hasn't changed since August 2013. If you tried the steps in this forum and the Edge 500 still isn't detected, then there is a problem with the physical connection, the device's memory is full, or there is corrupt data on the device.

If you still have trouble, you will need contact '>Product Support'> Product Support by phone for more detailed troubleshooting. If the device now shows as a drive and Garmin Express is running with the triangle at the top of the screen, please try the download again. If it still doesn't, you will need to try a different computer. If it does not, try a different USB port. The device should show as a drive in 'Finder'. If your Mac has 'USB 2.0' ports and 'USB 3.0' ports, please use the 'USB 2.0' ports.Make sure your device is plugged directly into the rear a desktop Mac or directly into the side of a laptop Mac.Use the ' GARMIN' brand USB data cable.Disconnect all other USB devices from the Mac except the mouse and keyboard.If the service is running, we need to check the device's connection. ( This is the background service for Garmin Express.) Please verify that there is a black triangle at the top of the screen just to the left of the Mac's clock when you start the program.

An exception may be if part of Garmin Express isn't actually running anymore. Changes in the Garmin Express program should not affect how the device is detected. I am sorry you can't get your Edge 500 to be detected by Garmin Express and I am happy to help.

Edge for macbook