Now Boeing admits it was aware of AoA Disagree issues well before the Lion Air disaster from a time before the first sales had been delivered. They now say this issue was to be addressed in a later software update but didn't get round to mentioning it to the FAA until a month after the Lion Air crash.
They also claim the AoA Disagree alarm was included as an optional extra "inadvertantly".
https://www.bbc.co.uk/news/business-48174797