V2Plus4 on original fw not supported by NanoVNA-App (as i remember, Owo not want fix several things in firmware for support)
Need fix several problems in exchange protocol on V2Plus4 side (or fix NanoVNA-App)
My fw for V2Plus4 allow work vs NanoVNA-App, but not support last V2Plus4 hardware (different LCD module).
I suggest use NanoVNA-QT, this software created for V2Plus4, and support by designer.
