It appears that Iran released further information from the black boxes.
https://www.euronews.com/2020/08/23/...ne-jet-in-iran
The head of Iran's civil aviation authority Touraj Dehghani Zanganeh said that the cockpit voice recorder registered a conversation between the pilot, co-pilot and an instructor between the two blasts.
"Up to 19 seconds after the first missile exploded in the vicinity of the aircraft, (they) noticed abnormal conditions and were in control of the aircraft until the last moment," he said, quoted by state television's website.
"The instructor indicates that the aircraft has an electronic problem and the auxiliary power has been activated," he said.
"The pilots were notified that both engines of the aircraft were on."
He said the black boxes stopped working 19 seconds after the first explosion, making it impossible to retrieve data on the impact of the second missile.