Is there a way to down grade my Mac Pro 5,1 firmware so it will run Snow Leopard?

If so will it still run Lion?    I believe this machine is the same hardware that ran Snow Leopard 6 months ago.   Brand new Mac Pro 5,1 two months old. 

HURRAY!!!  Houston we have Snow Leopard!!
FatMac your post of the firmware data got me digging deeper....   To sum-up
Prior to the death of the old Mac Pro1,1.  I was in the process of re-building my emergency boot disks.
As a result my Snow Leopard Emergency Boot Disk (SL EBD) was a fresh 10.6 install.
The old MacPro died before I was able to update the SL EBD to 10.6.8.  This I of course forgot.
The new MacPro would not boot from the old MacPro hard drive (10.6.8).  (It must have gotten taken out in the crash).  And obviously would not boot off of the SL EBD.
Initially Apple told me that the new MacPro would run SL.  But later conversations with tech support emphasized that it would not and it was standard practice to not make new machines backward compatible.
I assumed I was done-for.
Thanks to FatMac's firmware info, I investigated deeper and found my SL EBD was only 10.6. 
The 10.6.8 combo updater will not run from Lion.
Now if I could somehow boot into Snow Leopard  so I could do an update.  
I stumbled across a Carbon Copy Clone sparse image of my old MacPro 10.6.8 start-up disk that I had made DAYS before the crash and burn of the old MacPro.   (Am I lucky or what?)
CCC'd the old sparse image on to a spare hard drive, restarted & Bingo!  I was running Snow Leopard! 
Ran the 10.6.8 combo udater and updated my Clean Snow Leopard install.   Now I have a virgin copy of Snow Leopard to boot from. 
I guess I can toss out my Leopard 10.5.6 Boot disk.
Now I need to make a sparse image of the virgin Snow Leopard boot disk so I can re-install it at anytime in the future.
Anyone know how to burn an 8 Gig sparse image onto to several DVD's for archiving? 
FatMac,  the screen capture was the old fashoned way... I pointed a camera at it. 
Thanks to everyone for their contributions.  
Today was a good day!!!    

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