That was exactly what I did for my Ref-1. When I just got my Ref-1, I detect a channel imbalance issue and have contact Kingwa for help. This "imbalanced" issue later I finally confirmed that may come from the extremely high temporal resolution of the DSP-1 chip (and according to Kingwa). If the source (in my case the USB/SPDIF converter) timing is sloppy or the USB connector got disturbed, the digital signal train to DSP-1 (and its cached data) may be out of order or mis-synch (my interpretation so don't quote me on that). He mentioned the new software loaded in DSP-1 may address the issue so I followed his instructed (as described below) and swapped a updated DSP-1. The new software does help but the problem was totally solved when I also fixed my source.
However, I can't tell if there is SQ difference since the new DSP-1 was totally not burn-in and it was difficult to compare. Kingwa was hesitate to swap DSP since he is worried that i may not like the un-burn-in DSP sound.
And it does take me several months to fully appreciate the superiority of Ref-1 with updated DSP-1. Way off the league of my previous DACs.