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Do you have a link to that footage? I've seen speculation on this from very blurry video but nothing like proof.

On the professional pilot forums the consensus guess is inadvertent flap retraction, instead of gear retraction, leading to inability to climb.

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A 787 can still climb with flaps up and two healthy engines. In the video that was posted everywhere, you can CLEARLY hear the RAT spin, which gets deployed automatically when both engines go out.

> A 787 can still climb with flaps up and two healthy engines

Not at takeoff weight with the gear down, this sentence is incorrect.

Or birds hitting both engines. But that must have been a big flock then

It's unlikely that a bird strike with dual engine failure would occur without smoke.

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