The report detailed a series of moments where the shootdown of Ukraine International Airlines Flight 752 could have been avoided.
"It raises more questions and more questions", Mr. Esmaeilion said.
A misaligned missile battery, miscommunication between troops and their commanders and a decision to fire without authorisation all led to Iran's Revolutionary Guard shooting down the jetliner, the new report says.
The shootdown happened at Tehran's main airport the same night Iran launched a ballistic-missile attack targeting USA soldiers in Iraq, its response to the American drone strike that killed Guard Gen. Qassem Soleimani in Baghdad on January 3.
The "forgetfulness", CAO has insisted, led to a 107-degree error of the anti-air unit's system. It also comes as public opinion remains low over Iran's government as it faces both crushing US sanctions and vast domestic economic problems.
The Boeing 737 was struck by two missiles, killing all 176 passengers and crew.
'If each had not arisen, the aircraft would not have been targeted, ' the report said. After spotting the unit and notifying the command about the object, the operator fired a missile at the target "without receiving any response from the Coordination Center". The system is mounted on a tracked vehicle and carries a radar and a pack of eight missiles.
CAO report says, at 4 a.m. that day, "the military informed the civil air department of the country that only the planes already identified by the air-defense network and received its permission were allowed to take off from the airports' runways".
The second missile was shot 30 seconds later, taking into account " the continuity of the trajectory of the detected target", the report adds.
"After summarizing, a full report will be presented in this regard and then, we will take the necessary actions in accordance with the findings that will be made after the investigation", Mousavi added. "It was calibrated wrong just for PS752?" Six people believed to be involved in the incident have been arrested, a government spokesman reportedly said in June.
Although the Islamic Republic has repeatedly admitted that it is not capable to decipher and read the data recorded on the plane's black boxes, it has failed to handover the flight recorders to other countries.
Canada and Ukraine have demanded for months that Iran, which does not have the technical means to decode the plane's black boxes, send them overseas so their contents can be analysed.
Mr Champagne said Canada would continue to push "to ensure Iran follows through on its commitments" including transferring the data to the BEA.
The recording is allegedly a conversation between the family of one of the accident victims and Hassan Rezaeifar, who at the time was leading Iran's investigation into the incident.