Hi Jonny,
I haven't bothered updating my SD1+ yet.
( I think mines got 4b & working fine)
Just be careful updating an SD1 to " SD1+ " format.
I'm not all that familiar with Ketron models, but the SD1 & SD1+ as far as I'm aware is not the same machine.
My SD1+ came with an SD1 Manual plus an additional SD1+ manual with the extra functions etc available in the sd1+.
I think that may be like trying to put a kn7 update into a kn6.
AJ would probably be suited to help you.

best wishes
Rikki
[QUOTE]Originally posted by Gunnar Jonny:
[B]