Kingo Android Root 1.0.8 worked for me ! FREE
Kingo Android Root 1.0.8, which I downloaded from magorgeeks, successfully rooted my Blu Dash 3.5, model D170a.
Previous versions did NOT work, but the new scripts have been added, and its FREE.
root verified by super user and "root checker basic", free from google play
downloaded my version from majorgeeks.