I will soon be the owner of a ketron sd1 keyboard, and the software at this time is 4.0.a.

Can see that more updates is available now - which means both 4.0.b and 4.0.c

How do i get forward, go directly to 4.0c or first 4.0.b and afterwards 4.0.c.

maybe there are even other updates I have to make in the ketron before using it.

thanks for any answer in advance.

Best regards