If my memory is correct, I don't think the SD Card was introduced to the KN keyboards until after the KN6000. I seem to remember only Floppy Disks were used in those earlier days. If that is the case, it is likely the KN2000 system is unable to read any SD Cards. The good news is the Floppy Disks are still available and works well with all the models of the Technics KN keyboards albeit they do not load as quickly as an SD Card.

Hope you are able to solve this problem for your friend - for me, there still isn't a keyboard in the World that can beat my KN7000 keyboard.

Regards to all - Audrey Turner