Am I being a bit thick as I am sure I have done this before with no issue. I have downloaded the latest radio logos via the update portal and put them on the Nav SD card that comes with the car.

 

Gone to station logo select via the radio system and can't get access to the files, all the options are blanked/greyed out.

 

Does it need to be on a separate SD card and does it need to be formatted FAT32?

I think it needs to be a separate SD card iirc. At least for the Amundsen

i put mine onto a usb stick managed (with out the aid of the girlfriend!) to put the logos on to the relevent stations.

Did you put the logos in root directory or a separate directory?

So - you need to take OFF the logos from the NAV SD Card - and put them onto a new SD Card - and use SD card slot 2.

 

Put your logos into a folder called "RadioLogos" on the new SD card.  Then you know how to get at them.