The tablet does not have any preferences so there is nothing I can do. At this point, I would just contact Huion for repair or replacement cause that's the only choice I have unless M1 Mac mini is still broken.I'd still try a cable swap as you've nothing to loose at this point. Does the table have any preferences? if so might be worth to delete them from the Library, unlikely to change anything as an IPSW restore should wipe everything.
what makes least sense is that the tablet work as intended on your other Mac, which leads to a 11.5.1 issue, yet the revert to 11.4 fails to resolve? I wouldn't be too happy either as wiping and resetting takes time and that costs, worse no resolution...
Q-6