Dal forum
Garmin:
You can reformat the drive and then the O/S will rebuild the file system.
Using a PC right click on the Garmin device and select format.
Choose FAT as the file format and deselect the "quick format" option.
After the reformatting is complete dismount the
Edge from the PC and switch it on. The Edge will then rebuild the file system.
There are a few files that will not get rebuilt. I have placed those here.
[url]https://dl.dropboxusercontent.com/u/...Edge510_FS.zip[/URL]
You will need to download the zip file an unpack it in the root or top folder on the Edge.
IYou can then use the webupdater to update the timezone map and download any additional languages that you need.