Hi,

in the german version it´s written a bit more detailed

"...The keyboard is now ready for the actual update and turn it off and back on again while holding "F10" and "UNPLUGGED" Keys for 3 seconds...;)

Now you can release the both keys and wait.

Keyboard will reboot, a message "Updating..." appears.

Finally you get "Press th OK-Button" to reboot.

That´s it.

Now I´m checking for errors