I'm using DJI N3-AG FC with a third party system (pump + Flowmeter). And I need to set F5 as an input port as it has been mentioned in the user manual (A3-AG / N3-AG Agriculture Kit 2.0 User Manual v1.2).
I found two issues:
the N3-AG use DJI Assistant 2 For MG (V2.0.18) and not the standard DJI Assistant 2