C90w saving route, tracks etc

I have a c90w and need to do a software update but need to save the routes, waypoints, tracks etc before updating. Unfortunately each time I try saving the information to a CF card I get a message that the Save Failed. In talking with tech support they advised using a smaller CF card (tried 512mb to 3GB cards and none worked). Not sure why this would be an issue but l've tried 4 different cards including a card from RadarMarine. Each with the same, failure to save result.

I've also tried saving with the card in / out of the card reader and with the MFD powered on and off.

Any suggestions?
Thanks
Frank