toolboard device conflict

I'm trying to configure my printer for a pico-mmu, where I have an EBB42 on the toolhead (vc3.1) and another for the mmu. They're both coming up as t0.
I tried following the instructions at https://github.com/lhndo/LH-Stinger/wiki/Pico-MMU-RatOS
but my situation was different, in that both of my toolboards had already been flashed as t0 at some point (the one now on the MMU was originally on the toolhead as I was assembling it, but the USB broke off and has since been repaired).
I've tried USB flashing just the 2nd one (they both appear as t0 in the configurator),
I've tried USB flashing both the first and second board,
and I've tried DFU flashing the 2nd board.
I've also tried overriding the t0 mcu entry in RatOS to use something other than the /dev/RatOS entry.
I haven't been able to do anything to make the symlinks in /dev come up one for each (excepting by-path, which I tried to use to override as mentioned above, but unsuccessfully)

ratos-debug1.zip2.9MB

dev-log.txt1.74KB

GitHub

Pico MMU RatOS

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