Very early BDA3 units may need a software upgrade, in addition the more recent software eliminates sound artifacts when switching between DSD and PCM formats. The latest production software version should read 2016.05a (it can be displayed using a web GUI). However, the old units need to run a special firmware to update the PLD chip in addition to the main control software. That special PLD firmware is contained in file BDA3_2016_11p.bin which is otherwise equivalent to the current production software 2016.05a. The bin file is available from Bryston. Specifically for BDA3 software updates, please email sbleszynski@bryston.com and put "BDA3 'serial number' firmware" in the subject line.
Stan