RatOS/MCU/Klipper failure after update (Octopus Pro 446)

I have a BTT Octopus Pro 446, VC3.1, 400mm. Just did an "update all", which never goes well but usually I get through it. Not this time.

MCU Protocol error

This is frequently caused by running an older version of the
firmware on the MCU(s). Fix by recompiling and flashing the
firmware.

Your Klipper version is: v0.12.0-267-g12cd1d9e-dirty
MCU(s) which should be updated:
mcu: Current version v0.11.0-200-g7511151a
Up-to-date MCU(s):
<none>

Once the underlying issue is corrected, use the "RESTART"
command to reload the config and restart the host software.

mcu 'mcu': Command format mismatch: query_adxl345 oid=%c rest_ticks=%u vs query_adxl345 oid=%c clock=%u rest_ticks=%u


Annoyingly, there seems to be acknowledgement of this issue on the the RatOS 446 config page, but the link there doesn't work. It looks to be a link back to RatOS/mainsail, which just takes me back to the error.

There is a directory in my machine tab for firmware_binaries but it's looks last updated May 18, 2023. So that's probably not the binary I need to flash. I feel like I should just be able to download a new binary onto SD card and flash the Octopus, but I'm not clear where to get it.
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