According to Dagmawit Moges, the black box from the plane crash was in good condition and nearly all data was extracted.
The black box of the Ethiopian Airlines' Boeing 737 Max that crashed on March 17 has been recovered and initial findings pointed to many similarities to Lion Air's crashed plane in Indonesia that happened in October a year ago.
Boeing Co said on Sunday it was finalizing the development of a software upgrade and a revision of pilot training for its 737 MAX, the plane that has suffered two fatal crashes in the last five months.
The causes of both crashes are under investigation.
Investigators examining black box recordings from the doomed Ethiopian Airlines flight have found "clear similarities" with a previous crash.
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President Donald Trump grounded all of the 737 MAX jets in the United States several days after the Ethiopia Airlines crash.
Analysis of the data from the black boxes of an Ethiopian Airlines plane that crashed, killing all 157 people on board, showed "clear similarities" with an earlier crash of the same jet model, a spokesperson for the Ethiopian Transport Ministry has confirmed.
Last week's Ethiopian crash sparked the concern of aviation authorities that there may be a design fault with the craft, wiping billions of dollars off Boeing's market value and grounding the planes in countries around the world. Shortly after their takeoffs, both pilots reported flight control problems and tried to return to the airports but crashed.
Boeing has described the Max series as its fastest-selling family of planes, with more than 5,000 orders placed to date from about 100 customers.
The Lion Air plane had also been a Boeing 737 MAX 8.
USA regulators and safety experts are now asking how thoroughly the FAA and Boeing vetted the anti-stall system and how well pilots around the world were trained for it when their airlines bought new planes. The newspaper said the analysis also failed to account how the system could reset itself each time a pilot responded - in essence, gradually ratcheting the horizontal stabilizer into a dive position.
The FAA has said that the Boeing 737 will not fly until a software update can be tested and installed.