Perhaps the memory isn't purged, however the steps in my post at minimum make the fw8.x Dyna-Cabs invisible to fw9.b1 thru fw9.x, as they all push a dialog stating that the Dyna-Cabs aren't loaded, and once you exit that dialog my presets without a cab block all work fine.As I understand it, the memory used by Dyna-Cabs was reserved for future use and not used by the system in previous versions of the firmware. Reverting to an older firmware won’t purge the cabs/uninstall them or release the memory.
Pre Dyna-Cab versions of the firmware don’t look for the cabs so they won’t say whether the cabs exist in memory. And Dyna-Cab-aware versions will see they exist and not complain until the installed Dyna-Cabs are stale according to the firmware, then it will complain and want its related cabs.
So, basically, there’s nothing of benefit by trying to purge the memory. installing fw9b1 over the latest fw8.x essentially wiped or made invisible the latest fw8
Again, perhaps Fractal will chime in on the specifics?
NOTE: Important, I don't use the cab block preferring instead a Two Notes Torpedo CAB for 2048 point Dyn-IR's like the FM9/AFX3 provide, plus room/reverb and EQ with a roughly 20% CPU +- savings, and the Cab Block doesn't work in fw9.x without the expected Dyna-Cabs loaded.
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