Hi Canyon99,
Please excuse me - i did not realize you are asking for version 2 of the Boss DAC.
I just read the corresponding threads to it - and saw there is an issue with it.
So please be patient - or better - if you want to - help us by giving it a try 
I am happy with Volumio v3 and Boss v1.2 - unfortunately i do not own a Boss v2 DAC.
so it might not be so easy by just only following the instructions by now…
Sorry again for my “too fast” response.
May be it would be a good idea to ask at ALLO support ?
Best Regards
Josef