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Hi, there are instructions here to completely reset an Edge device: How to Format and Master Reset your Garmin Edge – Coach Gilberto Cortez

The idea is to reformat it (so all files are removed) and then the device will rebuild itself (from a non-writable part of the firmware). Then you may need to update over USB with Garmin Express. It should then work again.

Thanks.... just got an e-mail from Garmin support suggesting the same.

Hi Can you tell us more about what they suggest exactly? Would be interesting to know if there are specifics with the Explore 2. I know that reformatting it is important to rebuild the MBR, etc. Do they provide you with exact steps? Thanks!

Well the answer is in Dutch.... here the English translation by Google translate:

We recommend that you force and format your Edge into mass storage mode:

Force mass storage mode :

To force an Edge to enter mass storage mode, follow the steps below:

Disconnect the device from the computer
Turn off the device
Press and hold the correct button:
Edge Explore 2 : LAP/RESET
Connect the device to your computer
Wait for the device to be recognized by the computer (this can take up to 30 seconds)
Release the button(s).

Afterwards your computer will recognize the device as an external hard drive, and you can delete any GPX file in the folder Garmin > Courses & in the folder Garmin > New Files via the Finder (for Mac computers), or via Windows Explorer (Windows computers).

If this does not solve the problem, we recommend that you format the device, following the procedure below:

Format device :

NOTE: Only run on a WINDOWS computer and not on a Mac.

Before you start formatting the device, you should save the basemap to the computer.

Pair your device with the computer
Simultaneously press the 'Windows' and 'E' keys
Open the Garmin drive
Open the Garmin folder
Copy or drag the gmapbmap.img file to the desktop
After the basemap has been saved you can format the device:

Warning: Make sure it is your Garmin device and not another drive. If in doubt, do not proceed with formatting.

Simultaneously press the 'Windows' and 'E' keys
Right-click on the Garmin drive
Click Format
Uncheck 'Quick Format'
Make sure the File System is FAT32
Make sure GARMIN is listed as Volume Name
This process will take several minutes. When this is successfully completed, you can restore the basemap back to the device.

If necessary, create a 'Garmin' folder on the Garmin drive
Drag the gmapbmap.img file from the desktop into the Garmin folder
Disconnect your device from the computer and turn it off

Connect the device back to the computer, and run the offered updates with the latest version of Garmin Express