These are the instructions in English as provided to me by Technics for the upgrade. It's been a very long time so I can't remember much of the details. Maybe this will help with the German version translation.

To upgrade your SXKN7000 to Version 1.6

1. Turn the power off and insert Disk 1 into the disk drive.
2. Press and hold down panel memory buttons 1, 2, 3 and 4 at the same time.
3. While holding these 4 buttons, turn the keyboard on.
4. At the bottom of the screen choose “diskchk”.
5. Choose ‘check at the lower left.
6. Change to Disk 2.
7. After check is completed it will say OK Turn On Again.
8. Repeat steps 1 – 3.
9. This time choose Update – Follow instructions on screen to upgrade your SXKN7000 to version 1.6.