I have had enough of Yosemite (incompatibility issues, stability issues, slow speeds etc...) so I want to go to Snow Leopard. The problem is, is that snow leopard isn't supported on my 2012 Mac Pro (3.2Ghz). I know that the 2010 mac pro is identical to the 2012, and that a lot of people with 2010 mac pros upgrade the firmware to 2012. I want to do the reverse so Snow Leopard will be compatible. So, how would I downgrade the firmware of my 2012 Mac Pro to 2010?