I have a PSP and have done one system update on it before using my Dell PC. I tried to update it again today with the new update using that same comp. No luck, I tried several times, each getting an "error" message about copying files. Although the instructions on the sight said "PC" I thought what the heck, I'll try it with my iMac. Wala! It worked, and life is good, I'm beginning to like my mac more and more.