Just listening to the news report again:
quote: 'The 'dive mode' is activated by a button called 'knyupeli'
What the news report is implying is that the pilot could have accidentaly touched this 'knyupel' and not have noticed. Or this is a unprecedented act from the automatic system.
Im no 737 pilot, but i think the news report refers to the stabiliser trim button as the knyupeli, and that the pilot accidentally used it incorrectly because of fatigue, not realising the dive is cause by the trim button. Is such a thing possible?
Once again, im just translating. It doesnt make sense to me, and we have to account to news media dumbing down the raw data and not presenting it correctly.