It's reported they had radio and transponder problems from the beginning of their flight, hinting the generator/s may have never come online and this went unnoticed. The Do-228 crew were instructed to make frequent position reports via relay message because of this. They were diverting to Simara when they crashed. If the witnesses who said they heard the aircraft circling overhead before impact are correct, it's possible the Capt. misread the AH when it toppled, and tried to catch it, which would invole nose pitching down and increasing AOB. This manoeuver would result in a high speed impact and a crater very much like what is shown.
It's sad to hear this accident isn't getting the attention it deserves in Nepal, the investigation team has been told to give it's final report within 60days, many pilots say it will be done well before then. Anywhere else in the world would get much more attention paid to it, safety measure implemented, and changes made with the goal of making flying safer. Take the crash in New Zealand a couple of weeks back, they are expecting the report to be ready in at least 1 year, maybe 2. It will be thorough, and changes made to to prevent further accidents, already they have reduced the max pax to 6... But in Nepal, nothing. After every crash, nothing. If a pilot makes a hard landing and bends the aircraft it's the undercarriage's fault for not being strong enough, thats the mentality circulating. Their already poor flying standards coupled with terrible attitudes towards learning CORRECT techniques is proof there will continue to be accidents here unecessarily...