"Snow Leopard still working after Mac EFI Security Update 2015-001?
I have an early 2011 MacBook Pro and I would like to install the Mac EFI
Security Update 2015-001. Currently I am still booting between Mac OS 10.9.5 and Mac OS 10.6.8.
As I have read on Apple's website, the update must be done in 10.8.5+. (I think that's because they don't release updates for pre-10.8 OS's anymore.)
But I couldn't find any info if the Mac is still working ok with Snow Leopard after the update?
Best regards, Wolfgang"
IF all they did was improve write protect it should be ok, but I can't verify that as the only Mac I have that gets an updated bootrom from the EFI security update is a 2012 Mac Mini - which can't boot OS X 10.6.8 (or 10.7.x) to test. (The 2012 mini's bootrom went from MM61.0106.B03 before to MM61.0106.B08 afterwards, so there could be other changes as well.) I also have a 2009 Mac Pro but per Apple's doc, the only Mac Pro that gets the bootrom security update is the late 2013 model.
If anyone has applied the Mac EFI Security Update and also has an OS X 10.6.8 volume they use with that Mac (i.e. Early 2011 MacBook Pro - most macs that get the EFI update don't support 10.6.8), let me know (news @ xlr8yourmac.com) if you've seen any problems with 10.6.8 after updating the bootrom. Thanks.
(several others replied they had this question also but were not willing to update yet.)
The article's listing includes the bootrom version after the update for affected models. (Again, most of these Macs don't support OS X 10.6.8. The early 2011 MBPro's did.)
As I mentioned in the June 30th news, the doc on 10.10.4 and Security Update 2015-005 for Mavericks/Mtn Lion lists the same 2 EFI fixes as the EFI security update but just applying the Security Update 2015-005 to OS X 10.9.5 on the 2012 Mac Mini -did not- update the bootrom. Applying the EFI Security update did. They may have added some protection in the OS, but that software update would not be present in older OS X versions. (I do not use Yosemite so I can't comment if 10.10.4 also updates the firmware automatically.)
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