macOS 11.6.6 Update

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Nov 17, 2009
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Today Apple released macOS 11.6.6 Update, a major software update to macOS Big Sur. Update any supported system using the built-in Software Update functionality through the macOS System Preferences pane.
Screen Shot 2022-05-16 at 1.44.34 PM.png
What we know about the 11.6.6 Update so far...
  • macOS Build 20G624
  • Install macOS Big Sur App has been updated - If you downloaded macOS Big Sur from the App Store prior to today, and you want to have the latest version on your backup installer USB, simply log into the Mac App Store and click Download. The updated Install macOS Big Sur App can be found in the Applications folder.
macOS Big Sur 11.6.6 — Restart Required

This update is recommended for all users and improves the security of macOS.

For more information on the security content of this update see

Testing is now underway- this post will be updated. Good luck, and let us know how it goes! Report your results here.

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macOS 11.6.3 Update
macOS 11.6.2 Update
macOS 11.6.1 Update
macOS 11.6 Update
macOS 11.5.2 Update
macOS 11.5.1 Update
macOS 11.5 Update
macOS 11.4 Update
macOS 11.3.1 Update
macOS 11.3 Update
macOS 11.2.3 Update
macOS 11.2.2 Update
macOS 11.2.1 Update
macOS 11.2 Update
macOS 11.1 Update
macOS 11.0 Big Sur is Now Available on the Mac App Store
Update Directly to macOS Big Sur
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How to Prepare for Big Sur
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tonymacx86 Clover Theme (Updated for Big Sur)
Introducing the macOS Big Sur Critter!
Big Sur Desktop Support
Big Sur Desktop Guides
Big Sur Laptop Support
Big Sur Laptop Guides
Apple Announces "3rd Transition" for macOS: From Intel CPUs to Apple Silicon
macOS Big Sur Public Beta is Now Available
Apple Previews macOS 11.0 Big Sur - Available Fall 2020
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All fine. OC 0.74
X79 still strong :mrgreen:
Screenshot 2022-05-17 at 11.49.15 AM.png
Smooth update for 300-Series2 in signature and OC 0.7.6

This update may have fixed an issue in Safari 15.4 where the app went crazy - time will tell.

Checked Safari 15.5 box with update - no drama whatever!
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OpenCore 0.8.0, Drama Score... 7 outa 10!. Tried yesterday without success, stopped downloading!. Had another go this morning, unticked Safari update and everything worked, the drama!.
Screen Shot 2022-05-18 at 7.49.16 AM.png
Straight-forward upgrade with no intervention needed by me. Took a fair while though and several reboots. All handled perfectly by OpenCore 0.6.8:

Hello guys,
updated to Big Sur 11.6.6 some days ago. So far so good on my Dell XPS15 9570.
The updating process took about 3-4 reboots, 30 minutes, excluding the download which lasted in almost one hour!

DELL XPS15_BigSur update 11.6.6_2022-05-28 copy.png
Easy, peaceful update with Ivy Bridge CPU and Intel HD 4000 graphics, except my Bluetooth hardware information has suddenly disappeared from system information and I’ve lost Bluetooth functionality of 11.6.5 to 11.6.6, using a fenvi fv-t919. Everything else works great. Specs to the left and in signature.
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