Hey folks, I'm tearing my hair out over here trying to get an unsupported OSX on my Mac Pro 1,1. Which is annoying because I had it working previously. So, let me try and detail everything I've done: My Mac is a 1,1 with 2 x 3.0GHz quadcores and 32GB RAM. I have an MSI 280X Gaming that'll go in there as soon as I can get mavericks running. I read up like crazy on installing unsupported OSXs via Tiamo and then SFOTT to upgrade this otherwise capable machine. I have single 1TB Sata drive in it. I managed to create an SFOTT key to install 10.8.4 and it worked. From there, I managed to install Mavericks 10.9.1 successfully. I then updated my firmware to the 2,1 using the tool. While attempting to understand the instructions on the oemden site on how to upgrade past 10.9.2, I did something wrong and screwed up. I thought I created a key, confirmed the combo upgrade from an app store download, and the system rebooted to install. I was never able to get it to see my SFOTT key from holding OPT at boot, just main. When I let it continue, it just went to a screen where it let me mess around in Disk Utility, download mountain lion, or load a time machine backup. frustrated, I gave up for a week or so. I used my GFs MBP to create a bootable 10.6 USB. Did that no problem, installed 10.6, updated to 10.6.8, and now I'm stuck. I will detail everything I've done since then. First, I downloaded and installed the latest version of SFOTT. Then I used disk utility to erase an 8GB USB drive as a Mac OS Extended (journaled). Moved a copy of the Install OS X Mavericks.app into my applications folder. I downloaded and reinstalled SFOTT. I opened SFOTT, chose english, chose settings, selected my USB key, selected this computer, selected mavericks as the OS I wanted to install, and successfully pointed towards the app in the applications folder. I then went to create the key, chose to create a key in autorun, and let it do it's thing. About 30 minutes later it said it was ready. I restarted it and held down option, and the only choice i was given was the main drive. I tried restarting with the USB in every port. It was instantly recognized on desktop, but never during boot. I then tried it again, with the same result. So, this time, after erasing it, I made sure to create a partition and be positive it was GUID. Again, same result. I tried to make an SFOTT key in mountain lion, like I did the first time. Same result, no boot drive options other than main. Then I used the firmware tool to rollback my firmware in case that was a problem. Same result. I then put a spare HDD into a bay, formatted it as Mac OS Extended (Journaled), and created 2 partitions, both GUID, one of them 40GB for the SFOTT key to be created on. I then used SFOTT to create teh key the same way, but selecting the 40GB SATA partion instead. It created the key SOOOOO much faster, in like 5 minutes. But, same result. Tried to make a mavericks key with it, same result. So, for some reason, SFOTT isn't creating bootable images, even when it used to. Can anyone tell my exhausted and not mac friendly brain what I did wrong? What detail am I missing that I didn't miss (but forgot) the first time? Does it need to be blessed or something? And if so, how do I do that? Thanks in advance for helping out this dummy.