As modern as DJI is I'd bet 24 and their Tech Specs only say 24 but that's not definitive. Go on to their Communities or Support Chat and ask the question. Report back ;).
There really is nothing you can do beyond connecting each to your computer and running the appropriate DJI Assistant version. For all of my drones that is DJI Assistant 2 Consumer Drone series but I'm not sure if that correct for your. If that...
I spent hours trying to figure out why two of my 7 DJI drones would not fly over some low setting. Two Chats with DJI support got nowhere, nor did a conversation in their forums but finally a third chat armed with proof that it was their drone...