Force firmware

Has anyone done a firmware update. Mine was on .01 and I updated to version. 04 akais website does not list the 0.3 and 0.2 versions so I presumed just loading straight to .04 would be fine. However.... I have noticed on a video of someone installing version .02 that the file is a lot bigger. Which leads me to believe that I have missed important updates from previous versions. Can anyone confirm if firmware needs to be installed in order and if so where can I get versions .02 and .03 from

If i manage to get these versions is it ok to follow the same update process to rollback the firmware to a previous version.

No, just install 3.04, that gives you the latest, up-to-date firmware with all features, no need to install anything inbetween.