This is way Off Topic for this thread. If you are trying install Yosemite on your MP1,1, you need to update your MP1,1 firmware (32bit) to 2,1 (64bit), period. See the MacRumor's Mac Pro forum section for a thread that walks you through the update. If you are trying to run UniBeast to make a USB Installation thumb drive, then you need to use UniBeast for Yosemite. But, you can not install Yosemite on a MP1,1 without first upgrading the Mac Pro's firmware to MP2,1.