The factory reset option does not do the trick. I'm still seeing my personalized files showing up, for example, the modified startup.txt and the gmapsupp.img (from Openstreetmap).
A full reset will not be able to restore the basemap and may not clear the startup.txt, but it should remove all other files.
Non-prompted Non-Vol Clear - Clears NV and deletes all FIT files including Activities, Courses, Workouts.
Turn device off
Hold Lap/Reset and Start/Stop
Press and release the power button
Continue to hold only Lap/Reset and Start/Stop
Release Lap/Reset and Start/Stop when the Garmin Logo is cleared
The unit will restart and clear non-vol
I have tried this a few times but unfortunately it does not restore the device to factory. I'm doing this to troubleshoot the Wi-Fi issue. When I first got the 820, I was able to add one Wi-Fi network but ever since, I have not been able to add additional networks. I did a "factory reset" within the 820 hoping to fix the issue and now it won't even see a single network. Adding the Wi-Fi network manually also does not work.
I think this is how to restore to factory, at least to the latest factory firmware, deleting all applications, customized startup.txt and :
1. Connect to computer
2. Delete all folders and files in Garmin folder
3. Disconnect from computer
4. Power off Edge 820
5. Press and hold lap/reset and start/stop buttons
6. Press and release the power button
7. Release lap/reset and start/stop buttons after the Garmin logo goes away
