Hey there! I am not exactly sure what firmware, but I haven't upgraded firmware in at least 6 months. But like msinger said i believe you can downgrade it as well!
Selling my Phantom 3 Pro
Phantom 3 Pro
Military grade microraptor case
1 controller
1 set of extra props
1 set of extra gimbal clamps
4 batteries
Let me know if you have any questions. Here is a few pictures of the kit. Asking 600$
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