They are up to at least STAC.55.07:
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[Cable] Cable Modem Firmware Compatibility (DCM475)I have a copy of 55.04, but I don't know of anybody with anything newer.. Worth asking mlord though.
EDIT: Actually, 55.08:
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Re: Firmware versionAnyway, videotron pushes firmware upgrades, so it is much much less important.