CVR and FDR readouts doesn't help much with investigation of the accident. Defence ministry doesn't agreed yet with version about crew error (particularly flaps instead of gears retraction) as the case of crash. MAK and Central Aerohydrodynamic Institute (TSAGI) will make mathematical model of the flight, which will help calculate two still unknown figures - TOW and centering, source told "Kommersant" newspaper.
https://ria.ru/incidents/20170207/1487313165.html