It's in the old M FW archives. Search for the file in your M FW directory. Mine was in:

..\Meridian\800_Series\800_Series\861_4\c00044.mfu

But could also be in v3.51..

Just be sure you have your current DSPC backed up so you can rollforward again. Press Display/Display+Fn to display your current FWs on your processor. Powercycle afterwards. And please give feedback of any impressions in the DSPC sound influence thread.

DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8, 210, Sim2 Ultranero 4, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Dune HD Duo Cinema 8K and Wireworld Platinum 48G HDMI -> UHD722 -> Shunyata Omega Ethernet. Shunyata/Furutech power-cables/filters. SR Master Fuse@861v8. Uptone Etherregen with 10MHz OCXO clock.