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Apparently it can be done by refluxing in a mixture of HCl saturated with NaBr or by refluxing with hydroiodic acid. It is on Erowid, although it seems that dxo makes your asshole hurt for some reason. They didin't really go into too much detail on how the effects were different than DXM, except that DXO made their asshole hurt and caused a droning noise in the ears.
~*TuRn uR CaN'ts into CaNs...and uR DreAmS inTo PlaNs*~
~>I'll shake forever and I'll never care<~
~>I'm a building jumper<~
~>Roof to roof you see me flying in the air<~
Let's make some fuckin' money ! $$$$$