Have you tested passing data into the mux and on to the ASIC? I had something similar rigged up back around March (the last time I had any time to work on it) but could never get it to kick on correctly.
I haven't tested anything firmware related. I made a development board which just has the BF16 and BF250 installed this way I can send out dev boards for testing. 2-5A bench power supply will be needed. Yea I had this PCB since early last year and with no success on finding a developer I chucked it to the side. Now btc is high and I don't mind giving it another look. I have about 50 pcs each of the BF16 and BF250.