https://phys.org/news/2019-03-boeing-anti-stall-ethiopia.html

On Friday two anonymous industry sources told AFP the upgrade should be ready in about 10 days.

Muilenburg's announcement came after Ethiopia's transport minister earlier Sunday said black box data recovered from the Ethiopian Airlines plane that crashed last week shows "clear similarities" with last year's Lion Air accident in Indonesia—which involved the same Max 8 type of aircraft.