said by MrCodeDude:It appears that one solution is to take my modem to a different person's house and see if it works there? If my friend lives, literally, 200 yards from my house and has a working SB6120, is that far enough or did his probably just ship with updated firmware?
His 6120 probably already has the newer firmware,
SB612X-1.0.3.0-SCM03-NOSH
I would post in the direct forum, truck rolls won't do you any good here.
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Comcast DirectSteveTeow
should be able to get the fw updated and resolve your issue.