Latitudes, as an example. especially are recommended to go no more that 2 or 3 at a time. Considering how old your version is, I would not recommend jumping all the way to the newest revision. I would say no more than 3 versions ahead at a time, in other words 03 to 06, etc. And possibly when you get to the newer critical versions starting at A12 then one at a time.
I have a T3610 Precision Workstation running Win 7 Pro that I bought new in 2014 and I have never updated the BIOS.  It is at revision A03.  The latest revision from the Dell Support page is A019.  Can I update directly from A03 to A019? The reason why I ask is that I read somewhere that if it is more than 2 revisions out of date it is recommended to install each update in order without skipping.  That would be a lot of updating.
T3610 BIOS upgrade: Can you skip a bunch or do they all have to be installed 
sequentially?