I want to install Yosemite on a MacbookPro4,1 that has a broken firewire system
I don't really see a question here.  What is it you need help with?  You should be able to get 10.10.1 either by (a) installing it on a working system and swapping the hard disk or (b) installing it on a working system, take a Time Machine backup, then restore said backup on to the broken system.