My P4PV2 Outer Lense screws off and per my understanding is just a DJI Filter which can be replaced with a UV or other filter of your choice.
There are good posts on this topic if you want more detail. Wrap a rubber band around the outer ring, do a (lefty loosey) and it should come right off. If you use a lot of force it will bind up. That is why we use a rubber band. I heard rubber gloves work also.
FWIW, I replaced my DJI UV glass filter with the Polar Pro version (UV Filter | Standard Series | Phantom 4 Pro / Adv). It's a bit more solid and so in my mind it will protect the lens a bit better. That could just be good marketing but it's worked perfectly for me.
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