Bought and Tested the DJI RC Plus on Ebay that claims to work with the Mavic series of Drones. Guess What? IT DOES WORK! I'll tell you why.

[rexster1505]

For those that have recently purchased one of these controllers for your Mavic 3, This might be a dumb question: you say the R1, R2, R3, C3 buttons don’t work, but what about the L1, L2, L3 and other scroll wheel?
The top buttons are for the Matrice models. You can't reassign them as you are correct. It's just a huge RC Pro. The extra scroll wheel doesn't work for the same reason.
I feel like the answer is that it doesn’t work as this controller is essentially a RC pro controller, but I just wanted to confirm.
Confirmed
I ordered one, but mainly because I heard it works with air 2s and DroneLink and it’s got a bigger screen and better battery life. It’s essentially an RC Pro with a lower price tag and a bigger body.

Exactly

 

[DroneFarmerLLC]

Exactly

Thank you for that confirmation.

 

[arfrahmanhakim]

I have a DJI RC Plus RM700B Agriculture. Can anyone help me to change to RC Pro RM510 firmware?

 

[Teddy1702]

You need the firmware 03.01.0600 you can download this from drone-hack, to install that i think you must go to System, go to Android Version No, click 10 times there and than open a news directory, Developer option. I think there you must adjust that it is allow to goto bootsection. But i'm not sure how to adjust and load the firmware. Maybe same body now the Android 10 System and can help? Sorry for my english