Yep, doesn't do anything on my 3g either... But then, since it's got a slightly buggy screen, it was reset to factory defaults a while back... :/
On the plus side, I updated the python packager to sign the bundle files & handle UK Kindles, so it'll be ready once a jailbreak works.
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@ecostin/anyone with a serial access: I'd like to take a look at the /usr/sbin/otaup script, see what changed...