Can I install Snow Leopard (downgrade) on the mac book pros that are released since the 24 oct

Hi,
it ist possivle to downgrade/ install Snow Leopard on the current Mac Book Pros that are now sold on the apple store?
I knew they are improved since the 24 oct 2011 but did it change the firmware too?
Thanks,
Anna

According to this http://support.apple.com/kb/HT1237 the Late-2011 MBPs have the same EFI-version than the Early-2011 ones ( MBP81.0047.B24 EFI 2.3) but different (updated) SMC-versions.
And since the Late-2011 MBPs ship with OSX Lion 10.7.2 chances are slim that an older OSX version will work.
http://support.apple.com/kb/HT1159
Stefan

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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
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Hi guys...
A friend of mine brought me his Macbook to fix it because the hard drive was making sounds and now won't boot.
The drive in fact is bad, it barely mount, makes noises, etc.
I've replaced the internal hard drive for a Toshiba 320gb SATA 3.
The thing is that apparently the DVD doesn't recognize my drive and of course, i can't install Snow Leopard.
My question is, is this a problem with the new drive?. I believe that being a SATA3 could be causing the problem.
Second question... Can i install Snow Leopard (somehow) using my Mac mini?
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Regards.
Francisco.

Hi!!
>I've used another internal hard drive and installs correctly<
Using the DVD installer?
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So it boots with another hard drive in there but ejects when you put the Toshiba in there?
Yes but it only make sense if the DVD would create a temporary partition or something in order to install the OS.
>Could it be that the drive is SATA3? <
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>or maybe the hd is bad?<
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Regards.
Francisco.

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I have purchaded Snow Leopard, but I can installed it
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Best regards and merry christmas
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Can I install Snow Leopard (downgrade) on the mac book pros that are released since the 24 oct

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