In the last message pilot is saying clearly that the engines are failed completely so I doubt that landing gears were even opened at any point, it's not that the pilot has forgotten to open landing gears, moreover pilot must have done its best as no one wants this to be happen, but seems like nothing gets work, as it is reported also that the engine were having issues even prior to take off, it seems like more a matter of wrong management, carelessness. Must be investigated thoroughly and the responsible must be punished accordingly as it took lives of more than 100 innocent people, cannot be ignored