You cant switch files, you have to reinstall each file just like you did with the first one. That overhead warning DPF full see dealer for service is common for some /a lot of people, efi live just did a work around to solve it, but if you purchased your files then they are most liked locked so that work around wont help you a bit. First off you can just read the how to install pdf that comes with efi live computer program, but if you got one installed then that works the same for the second.
