Your universe's product page claims to be able to handle adobe drm, just like my Afterglow 2 does. Have you gone to the onyx settings -> extensions -> DRM to register your adobe id yet? Once I did that, onyxreader handled my adobe epubs just fine.
My afterglow 2 had quite a bit of trouble downloading adobe drm'd epubs from an .acsm file, it would try and fail, but if I use another program, in my case Aldiko, to get the epub, then so long as the device and aldiko were registered to the same adobe id, both could open the epub.
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