MaxRotor RPM set.up with Jetibox and Mezon 120

I have a Mezon 120 installed in my Sirroco helicopter with Hacker A40 12 S engine.
I'm trying to setup MaxRotor RPM in the Mezon connected to a JetiBox.
Lowest value available is 10.000 RPM and according to instruction the RPM must be only 1350.
Does anybody know how to lower the MaxRotor RPM to less than 10.000 or is there too many digits shown in the display of the JetiBox?

Best regards
Christin

Please disregard my question, I found the solution.