Boss FS-6 not working on Nord Stage 4

[kalivodv]

Hi, does any of you guys use Boss FS-6 pedal on Nord Stage 4?

I am on latest firmware 1.64 and I can't get it working.
I use TRS jack connected to A+B. After connecting the pedal, Nord display error message "incompatible control pedal". Polarity of both switches are set to left and in pedal configuration on Nord I got "Dual closed". But it doesn't matter what I do, I tried switching different polarities on pedal/config, nothing helps.
In pedal menu, there are few "presets" for compatible pedals, but there is none for this particular Boss one.
I saw online that this pedal should work on NS4 so I went and bought it. :/
Is it possible the newest firmware blocks usage of "incompatible" pedals?

Any help appreciated

[FZiegler]

Did you insert a battery? It may be mandatory.

[kalivodv]

Did you insert a battery? It may be mandatory.

It is mandatory (I confirm, I had a FS-6 and changed it because of that)

@kalivodv: to which input of NS4 are you connecting it, Program up/down I presume (right)?

[kalivodv]

Did you insert a battery? It may be mandatory.

Yes, I did.

[kalivodv]

Did you insert a battery? It may be mandatory.

It is mandatory (I confirm, I had a FS-6 and changed it because of that)

@kalivodv: to which input of NS4 are you connecting it, Program up/down I presume (right)?

Ok, I am dumb. I was using "control pedal" input and it should be in "foot switch".
This is it. Thanks for asking the right question, haha

Btw what pedal do you use instead of FS-6?