Aren't the http and ftp servers turned off in car mode unless you specifically askr for them to be turned on in the config.ini to leave more memory for caching? From the FAQ: dc_servers=1 Allows kftpd/khttpd to run in DC/Car mode, which is off by default otherwise. No idea why the serial speed should have and effect.
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)