Still have not managed to fix my SD card and intermittent 'crashing' problems on my 660 - hard reset did not do much at all and Garmin are now recommending downgrades for affected customers or a RMA for a new unit.
Dear Garmin customer
Thank you for contacting Garmin Europe.
To downgrade the software please go to http://www.gawisp.com/perry/zumo/
and you will be able to see the Zumo 660 software version at the bottom
of the page. You will then simply need to click the link for software
version while your Zumo is plugged into the computer. Click to run the
software and follow the onscreen instructions to downgrade the system
software. After this test the device then try to upgrade the software
again.
If there is anything else I can help you with then please let me know.
Alternatively you can search for a solution here: http://www.garmin.co.uk/support
Kind regards,
Garmin Europe
Dear Garmin customer
Thank you for contacting Garmin Europe.
To downgrade the software please go to http://www.gawisp.com/perry/zumo/
and you will be able to see the Zumo 660 software version at the bottom
of the page. You will then simply need to click the link for software
version while your Zumo is plugged into the computer. Click to run the
software and follow the onscreen instructions to downgrade the system
software. After this test the device then try to upgrade the software
again.
If there is anything else I can help you with then please let me know.
Alternatively you can search for a solution here: http://www.garmin.co.uk/support
Kind regards,
Garmin Europe