Model-specific BIOS question

For a Dell LATITUDE E6400 (mid 2008?) with a BIOS of "A14" (5/11/2009), is jumping up to "A34" to much of a jump to make all at once?

I would rather not make a jump "up" and have the BIOS not work for whatever reason; so I am asking ahead of time.

I am primarily asking because the Service Tag for this particular laptop is not in the 'My Account' > 'My Products" database and so I am not 100% certain of the unit's provenance.  Like with the individual device Drivers, I have seen instance of version "A08" not working for a Network card but version "A07" works fine.

Thanks in advance!