I have an older iMac with 64 MB RAM and about 3GB hard drive space left. It is running OS 8.5.1. I just bought a new airport and a new iMac running OS 9.1. Apple tech help tells me that I must be running OS 8.6 or later for them to be able to share files through the airport. I tried to do a clean install of a new system folder using the CD that came with my new iMac on the old one, but it told me that I needed to update the firmware first. It said to look in the CD Extras folder, but I couldn't find anything in there that mentioned firmware updating. How can I upgrade the system? Is this an insidious plot by Apple to drive me mad? Please help! And could you make it simple, please? I'm kind of technologically challenged.