Beta 5 did have various problems with downloading - particularly over serial. Many bugs were fixed at the emplode end in both beta5c and beta6.

In general you should always run the same beta release of emplode and empeg-car software. Little, if any, testing is done with non-matching versions. This may actually be enforced in future versions.

--
Mike Crowe
I may not be speaking on behalf of empeg above :-)