[ams6110]

Post Lion Air, they should have known that.

[simion314]

Why exactly? if Boeing did not updated the manuals and checklists how would pilots know that? from internet forums? Should a pilots ignore the checklists and try steps he read on the internet ?

I could not find if Boeing updated their manuals/checklists after the first crash.

[cjbprime]

Yes, Boeing issued this service bulletin after Lion Air:

http://www.avioesemusicas.com/wp-content/uploads/2018/10/TBC...

And the FAA made it an emergency airworthiness directive in response.

The steps on it were broadly followed by the Ethiopian flight.

[ams6110]

Pilots should have known that MCAS is inactive with flaps extended, per information from Boeing.