DEVO 8

Using DEVO 8 for helicopter. Channel 7 is used to set one of three gyro conditions. Manual, stabilized and return to home. BUT, software, Devention 4 and 5 do not see switch position 0 (zero). It is a three position switch, but software only sees two positions.
Is this common problem and if so, a solution? Can't fly the helicopter without all three positions and their values. Could my transmitter have a faulty switch?

Vlad, thank you.
The Wakera G400 helicopter requires that Chan 7 controls the Gyro and Ch 8 control flight mode. The Flight Mode switch and the Gyro switch are three position types. I have tried using the :complex" setting for the Gyro's switch. In the complex menu we have: Mixers, Page, Switch, Mux, Srv,, Curve, Scale and Offset. I do not know what each is? Some make sense.
Please advise. It is not logical!

Here is an example.

I tried this as you showed it. Still, only two functional positions. Position Mix0 does not happen. Could I have a bad switch?

After all that time and effort.
IT WAS A BAD SWITCH!
I just happened to have an old three position switch from my old Futaba parts
Easy install and solder.
Thank you all for the help.

New question. How download and then copy "supported models" to the USB internal file system in the DEVO8? Do the chosen models have to use the same protocol? I have original Walkera chip. I want to load "BLADE" helicopter models.