Release Date ― July 29, 2025
Build Number― 24G84
Apple Silicon System Firmware Version― 11881.140.96
T2 BridgeOS System Firmware Version― 22.16.16083.0.0,0

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New Features & Changes(Found something new? Please press "Edit" on the bottom of this post and add it here)
Resolved Issues

• macOS Sequoia 15.6 Release Notes (Developer)
  • Fixed: Finder and Apple Configurator may be unable to successfully restore some devices from DFU mode. (153476458)

New Issues
(If you are encountering any issues, please press "Edit" on the bottom of this post and add it here)
-Macbook Waiting for Wi-Fi call activation... forever (After updating to 15.6). More details here:

Remaining Issues
Untested Issues

• Alarms may not play when your display is asleep for a long period of time (FB10086690)
  • Workaround: Make your display not fall asleep in Settings > Lock Screen > Turn display off on ____ when inactive. You can turn your brightness off.
  • Issue present since macOS 13.0

Additional Notes

• Please know,Memory Management hasalways been an issue on any OS (not just Apple's). If you believe there is a Memory Leak, please go to the Apple Menu > Restart > Restart to fix it.
• When a new macOS release comes out, all issues automatically go to "Untested Issues" until they are moved by someone.Issues that stay in Untested for 3 releases (beta or smooth) will be removed from all future threads. When there is a new macOS release, please be sure to let us know about the issue's status by moving it to either "Remaining Issues" or "Resolved Issues"
• macOS 15 Sequoia will be installed via a Delta Update in System Settings. Please be aware about this and the update won’t install with an installer.
• macOS 15 is officially supported on the following devices. If your device is not listed below, it has unfortunately been dropped by Apple. Any efforts of trying to get your Mac running macOS 15, including bugs should be discussedin this thread.
  • MacBook Air: Intel 2020, M1, M2, M3, M4
  • MacBook Pro:2018, 2019, Intel 2020, M1, M1 Pro/M1 Max, M2, M2 Pro/M2 Max, M3/M3 Pro/M3 Max, M4/M4 Pro/M4 Max
  • Mac mini:2018, M1, M2/M2 Pro, M4/M4 Pro
  • iMac:Pro 2017, 4K 2019, 5K 2019, 5K 2020, M1, M3, M4
  • Mac Pro: 2019, M2 Ultra
  • Mac Studio: M1 Max/Ultra, M2 Max/Ultra, M3 Ultra, M4 Max
• macOS Sequoia 15.6 Release Notes
• macOS Sequoia Overview
• macOS 15 Release Notes
• Apple Security Updates
• Become an Apple Beta Tester
• Full Installer (App Store)
• Full Installer (Direct Download)

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Feel free to add in any issues or new features that you have spotted in this release by clicking the "Edit" button below.

Full Installer (direct download):

15.6 Sequoia



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14.7.7 Sonoma


13.7.7 Ventura

rmrcu said:

I updated M1 MBP to 15.6 and I see:
System Firmware Version: 11881.140.96
OS Loader Version: 11881.140.96

Click to expand...

Maybe it depends on the Mac/M-Version. Even on 26.0 Beta 4 I always had those 11881 numbers for both.

nmt1900 said:

I see same versions on M3 Air. Might it be that some devices are updated to different firmware versions?

Click to expand...

Same time post. You also see both numbers are still the same?

I wonder what this new Firmware has changed on my Mac.

Edit: Not sure if it's a M4 thing or Pro/Max/Ultra or even what type of Mac it is. I just put both in the first post.

Adora said:

Same time post. You also see both numbers are still the same?

I wonder what this new Firmware has changed on my Mac.

Edit: Not sure if it's a M4 thing or Pro/Max/Ultra or even what type of Mac it is. I just put both in the first post.

Click to expand...

When looking at Tahoe beta 4 thread I see that same system firmware version there (13822.0.233). If you had Tahoe beta 4 on your actual machine (instead of having virtual machine), then it looks like system firmware on your Mac Mini got updated by that - and going back to Sequoia does not downgrade it back.

P. S. I see that note on firmware version in Tahoe beta 4 first post is made by you. Maybe we found the source of this mystery about non-matching version numbers

nmt1900 said:

When looking at Tahoe beta 4 thread I see that same system firmware version there (13822.0.233). If you had Tahoe beta 4 on your actual machine (instead of having virtual machine), then it looks like system firmware on your Mac Mini got updated by that - and going back to Sequoia does not downgrade it back.

P. S. I see that note on firmware version in Tahoe beta 4 first post is made by you. Maybe we found the source of this mystery about non-matching version numbers

Click to expand...

Thanks. Yes, I mostly was the first one in those threads who inserted it. Strange that I didn't notice it back then already. Seems I have to change it again here. 🙃

WilliApple said:

View attachment 2532756
Release Date ― July 29, 2025
Build Number― 24G84
Apple Silicon System Firmware Version― 11881.140.96
T2 BridgeOS System Firmware Version― 22.16.16083.0.0,0

---

New Features & Changes(Found something new? Please press "Edit" on the bottom of this post and add it here)
Resolved Issues

• macOS Sequoia 15.6 Release Notes (Developer)
  • Fixed: Finder and Apple Configurator may be unable to successfully restore some devices from DFU mode. (153476458)

New Issues
(If you are encountering any issues, please press "Edit" on the bottom of this post and add it here)

Remaining Issues
Untested Issues

• Alarms may not play when your display is asleep for a long period of time (FB10086690)
  • Workaround: Make your display not fall asleep in Settings > Lock Screen > Turn display off on ____ when inactive. You can turn your brightness off.
  • Issue present since macOS 13.0

Additional Notes

• Please know,Memory Management hasalways been an issue on any OS (not just Apple's). If you believe there is a Memory Leak, please go to the Apple Menu > Restart > Restart to fix it.
• When a new macOS release comes out, all issues automatically go to "Untested Issues" until they are moved by someone.Issues that stay in Untested for 3 releases (beta or smooth) will be removed from all future threads. When there is a new macOS release, please be sure to let us know about the issue's status by moving it to either "Remaining Issues" or "Resolved Issues"
• macOS 15 Sequoia will be installed via a Delta Update in System Settings. Please be aware about this and the update won’t install with an installer.
• macOS 15 is officially supported on the following devices. If your device is not listed below, it has unfortunately been dropped by Apple. Any efforts of trying to get your Mac running macOS 15, including bugs should be discussedin this thread.
  • MacBook Air: Intel 2020, M1, M2, M3, M4
  • MacBook Pro:2018, 2019, Intel 2020, M1, M1 Pro/M1 Max, M2, M2 Pro/M2 Max, M3/M3 Pro/M3 Max, M4/M4 Pro/M4 Max
  • Mac mini:2018, M1, M2/M2 Pro, M4/M4 Pro
  • iMac:Pro 2017, 4K 2019, 5K 2019, 5K 2020, M1, M3, M4
  • Mac Pro: 2019, M2 Ultra
  • Mac Studio: M1 Max/Ultra, M2 Max/Ultra, M3 Ultra, M4 Max
• macOS Sequoia 15.6 Release Notes
• macOS Sequoia Overview
• macOS 15 Release Notes
• Apple Security Updates
• Become an Apple Beta Tester
• Full Installer (App Store)
• Full Installer (Direct Download)

---

Feel free to add in any issues or new features that you have spotted in this release by clicking the "Edit" button below.

Click to expand...

This happened when I updated to 15.4 also, the link to purchase, in music, is gone. I click on "Buy" and the dialogue window that appears does not have a "Purchase" button. Anyone else having this issue?

Lisard said:

I updated to Sequoia 15.6 on my Mac M3 desktop two days ago and now the Safari Settings won't open. I've tried re-booting but it hasn't worked anything out and all the tips haven't helped either. Have I got to wait for a patch?

Click to expand...

Best option, download and run the full installer again:



I have only links to Safari Installers for Sonoma and Ventura but you could try installing the latest Technology Preview for Sequoia maybe it overwrites some Webkit files they share, or just use it instead:



You can also set the Software Update options in System Settings - General to Developer Beta for Sequoia, then you will get an update to the Safari 26 Beta. I have installed it and it works and looks like before. If you don't have that option you have to create a free Developer Account before simply by logging in with your Apple ID here:

Sign In - Apple

developer.apple.com