Drone crashed and flight log is missing

I am on my dronedeploy trial and was surveying a site in order to create a topographical map. As I was about to finish, the drone started returning towards me but started losing altitude and crashed into a tree.
I have no idea what went wrong, it should have come over the home point without losing altitude and then land.
Now I am unable to find my last position as the flight log for this last flight is missing. Could anyone provide a solution? I need to find the drone, and, more importantly the memory card in it.

Thanks a lot.

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