Did an upgrade of my Linksys WRT54GL to the latest OpenWRT firmware. These are roughly the steps I followed.

My old firmware was a OpenWRT rc5, default release. For my new firmware, I used the ImageBuilder to create a more customized firmware with a lot of packages (such as ntpclient, openvpn, nas, gpio, ...) preinstalled in the squashfs image. I left the new Webif^2 out on purpose, as it's updated at a fair regular base. The image (which has it's build list attached) is called cad, which is because I originally selected it for use with routers at work.

Anyway, updating my WRT54GL, was not a  ...