How do you check what firmware version thats installed now?

Go to the 3 dots in the upper right hand corner of the app,after pressing on them go to the bottom of the list where it says about and press on that. That will give you what version s you are running for bird,controller,app, and other things.

Yep, in the 'about' section within the app.

Hello there. I appreciate your time bringing this query to us. You can check the current firmware version of your unit by launching the DJI Go 4 app > Tap 'Enter Device' > Go to General settings > 'About'.

Thank you all very much

App version 4.2.2.0 - AC v 01.00.0400 looks like newest