Guns4Hire - I hope someone comes along to answer your questions. I have a Boyue T62D, but used the Boyue firmware linked in the first post instead of the Onyx, and it was super easy to install the update. (It works perfectly now.)
Is there some reason why you are choosing the Onyx firmware instead of the Boyue? If not, it is easier and less risky to just use the Boyue firmware upgrade.
I'm sorry I can't be of any help with the Onyx issues. Best of luck to you!