Hi All I have the old style Garmin GPS35 (looks like a PC mouse with long tail) This suffered the WRNO issue, and am now wondering if a firmware update on this particular device is possible. I have scoured the net for info but without much luck. On another note , I had the same issue with the Garmin GPS16-HVS , However I managed to find some info and have now solved the issue by uploading new FW into the device. Just wish I could do the same with the GPS35 device. Any help or info would be appreciated .