Yes, definitely, if software update lists these as updates, install them.
On Nov 13, 2011, at 7:27 AM, Gavin wrote:

> Hi Guys,
> 
> When checking for software updates, I'm told that I have an SMC as well as an 
> EFI update. I only got this MacBook Pro about a month ago, and I've updated 
> these twice since then. Should I download every single EFI and SMC update 
> that becomes available? I'm a little bit dubious about doing this, as there's 
> so much that could go wrong if one of these updates fails. Also, this is an 
> early 2011 MBP, which leads me to believe that if I continue updating the 
> firmware, I will no longer have any chance of downgrading to Snow Leopard.
> 
> Regards,
> 
> Gavin
> 
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