A quick page for those wanting information on how to downgrade the firmware in their Garmin Edge 500 units. Taken from here, which is a Garmin hosted page, so might disappear!

0. Download the firmware you want - below. Don't forget, this is for the Garmin Edge 500, not any other model!
1. Plug the 500 into the PC.
2. Once the 500 is ready, copy the file to the Garmin subdirectory on your unit, renaming it to gupdate.gcd. The 500 will appear as another drive on your desktop (Mac), file manager eg Nautilus (Linux), Explorer drive letter (Windows)
3. Save the following inot your Mac / PC / Linux computer so you don't have to recreate stuff:
Garmin\Settings\Settings.fit
Garmin\Elevations\Elevations.fit
Garmin\Sports\Cycling.fit (optional).
Updating the firmware doesn't usually mess with these files (a 'full reset' normally proscribed by Garmin support does).
4. Safely remove the 500 from the Mac / PC / Linux.
5. Power up the 500. If you are loading an older level firmware, it will ask you to verify you want to do this.
6. Let it update. This may take a while, be patient. Be very patient. Very.
7. Once the update completes, power the 500 back down.
8. Reattach to your computer and restore the files saved in step 3.
9. Safely remove the 500 from the PC.
10. Power up the 500, rescan for HRM, GSC-10, other devices, and re-pair them.
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gupdate240.gcd
(3493k)
Steve Mansfield,
May 12, 2013, 10:04 PM
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gupdate260.gcd
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May 12, 2013, 10:04 PM
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gupdate280.gcd
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Steve Mansfield,
May 12, 2013, 10:04 PM
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gupdate300.gcd
(3240k)
Steve Mansfield,
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gupdate320.gcd
(3240k)
Steve Mansfield,
May 12, 2013, 10:04 PM