Atomos Ninja2 corrupted file.

[Sebastian Fudali]

OK.
So I have filmed some stuff with the Ninja2 as recording device.
And one of the files looks corrupt, it occupies the appropriate space, it was working fine before next shots and now it doesn’t show length, cannot be played, MEdiaInfo returns error (the error popup keep appearing, when closed, even though I disconnected the SSD from PC, weird).
Any idea how to recover the video file?