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Anyone with EFI Security Updated Mac (bootrom) had any issues with OS X 10.6.8?
I saw a post with this question last week but it was from a 2010 Mac Pro owner (which doesn't get the bootrom update). Here's a mail from a reader with an early 2011 MacBook Pro wondering if the updated bootrom affects using older OS X versions like 10.6.8:

"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.)

Per the revised listing of EFI firmware updates, Macs that get an EFI security update are:

  • Early 2011 to Mid 2014 MacBook Pro
  • Mid 2011 to Mid 2014 MacBook Air
  • Mid 2011 to Mid 2014 iMac
  • Mid 2011 to Late 2014 Mac Mini
  • Late 2013 Mac Pro.

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.)
  

Recent Apple Support/How-To/Troubleshooting Article Updates: (later first)

(Topic-based page of Tips, Troubleshooting & How-To articles for Mac/OS X/iOS Users.)
  

Other News/Reviews/Tips/PR/OT:
Recent Updates, Tips, DIY Upgrades and Repairs:
List of Updates, DIY Repair, Upgrade articles, Tips and more you may have missed. (Topics range from OS/software updates, troubleshooting to hardware upgrades and repairs.)
  

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Previous News Archive Summary:
    July 2nd, 2015 News Archive
  • Nvidia Graphics Driver Update for OS X 10.10.4
  • Nvidia CUDA 7.0.52 Update for OS X Yosemite and Mavericks
  • OS X Server v4.1.3 (for OS X 10.10.4)
  • Apple How-To/Troubleshooting Article Updates: (partial list)
    - Learn what to do if your Mac won't turn on
    - How to manually migrate data from another Mac
    - Troubleshooting keys on the keyboard do not respond
    - Using the USB-C port and adapters on Early 2015 MacBook
    - Macs that get the EFI Security Update (and bootrom versions afterwards)
    - How to use Continuity to connect your iPhone, iPad, iPod touch, and Mac
    - Accessing and archiving content from iTunes U private sites
    - Get help signing in to Messages, FaceTime, and Game Center
    - Changes to iCloud storage for current customers
    - About Time Machine local snapshots
    - 5 How-To Articles on Final Cut Pro X

For links to older news pages, see the Archives.
  


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