The big problem is that `mstfwmanager` isn't installed as part of VyOS, and it's not compiled into the Debian bookworm `mstflint` .deb. I don't have a bookworm build system handy, either. In the end, I just dropped a bookworm APT config onto the switch and downloaded GCC and friends and built it locally. After that, following the instructions and updating to `mlxsw_spectrum2-29.2010.1006.mfa` worked fine. Thanks!
