In my experience, BD is really good with post purchase support, have you tried contacting them for guidance? In the past they have done really well by me, ymmv...
I did try BD and they are helpful to a point but initially they asked me what bike I had and charged me for a custom plug that would plug into my factory harness. After setting my pants I went ahead. I received the light and the plug was in no way plug and play.
I took it to Alan and Sons who told me my light was bad. I then called BD and they want to work with me but are asking me
To test a and b and c which frankly I would rather have someone else do as I have three small kids I am head mechanic and quartermaster for and right now I just want to ride.
I could keep going and bore you guys but I really just want a headlight that works. My old one the housing physically broke and the light was really unacceptable from the factory.