There are "clear similarities" between the Ethiopian Airlines crash that killed 157 people last week and the Lion Air crash in October, which involved the same aircraft.
Ethiopia's Transport Minister Dagmawit Moges was citing data from the black box of the Boeing 737 MAX 8, which crashed shortly after take-off from Addis Ababa on March 10.
The black box has been found in a good condition that enabled investigators to extract almost all the data inside.
Boeing chief Dennis Muilenburg said later on Sunday that the company was in the process of finalizing an update to its flight control software on the 737 MAX models.
US authorities had called for an update by April and Boeing said it would meet the target.
The MCAS is an automated safety feature on the 737 Max designed to prevent the plane from entering into a stall or losing lift.
Some pilots had complained about unintended nose-down situations while flying the Max 8 jet, according to US federal database.
Moges earlier said, "detailed information" based on the Ethiopian Airlines black box data would be released within a month.
The crash was the second tragedy involving a Boeing 737 MAX 8 aeroplane within five months, after a Lion Air flight crashed into the Java Sea off Indonesia shortly after take-off in October, killing 189 people.
There were no survivors in either of the crashes.
Several countries and airlines issued moratoriums on the Boeing 737 MAX 8 model in the wake of the second incident.
Ethiopia has enlisted the help of French experts in processing the contents of the flight data and voice recorders.
The relatively new Boeing plane crashed with such a force that it could take up to six months to identify the remains of the victims.
Officials have collected DNA samples from the victims' relatives that will be worked on by an international team of experts.
Thousands of people, including many family members, attended a funeral service for the victims in Ethiopia on Sunday.
Archive Pic: Fauzy Chaniago (AP) taken on the 1st of November 2018 after Lion Air crashed in Indonesia, killing all passengers on board.
