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macOS Sequoia 15.6 - Bug fixes, changes, and more

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The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
WilliApple

WilliApple

macrumors 65816
Original poster
Feb 19, 2022
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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 has always 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 discussed in 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.
 
Last edited:
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Reporting in...

My M4 Mac Mini Pro 64/2 GB survived the upgrade, rebooted 5 times.
Siri and Apple AI is STILL OFF, since from day one of installation, end of last year.
 
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I updated M1 MBP to 15.6 and I see:
System Firmware Version: 11881.140.96
OS Loader Version: 11881.140.96
 
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.

Screenshot 2025-07-30 at 14.06.25.png
 
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I see same versions (11881.140.96) on M3 Air. Might it be that some devices are updated to different firmware versions?
 
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.
 
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Then it might be really specific - only for 14-core M4 Pro or even specific Mac model. That has possibly happened before...
 
Model Name: Mac mini
Model Identifier: Mac16,11
Model Number: Z1JV000KTLL/A
Chip: Apple M4 Pro
Total Number of Cores: 14 (10 performance and 4 efficiency)
Memory: 64 GB
System Firmware Version: 11881.140.96
OS Loader Version: 11881.140.96
System Version: macOS 15.6 (24G84)
Kernel Version: Darwin 24.6.0
 
I have an M4 Pro Mac Mini and I've seen two issues since upgrading to 15.6 this morning:

  • When I make a screenshot it doesn't appear in the lower right-hand part of the screen anymore. Now, it just automatically saves to the desktop and doesn't give me the opportunity to send it to the clipboard instead.
  • iPhone Mirroring is slow, flaky, and has quit multiple times. (Please see the screenshot.)
Screenshot 2025-07-30 at 2.53.36 PM.png

I haven't noticed any other issues. However, it didn't secretly enable Apple Intelligence like it did for a previous release.
 
OK, found out that the Show Floating Thumbnail option had been disabled. 🤷‍♂️ So, that's working again. And after a reboot iPhone Mirroring seems to be OK. 🤞

EDIT: Added the second sentence.
 
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15.6 has been a bit of disaster.

1. Many of the program extensions which I use were disabled.

2. When I tried to enable them I was told to change startup security options

3. When I booted into recovery mode and got to the security utility it told me to change security options I had to boot into recovery mode ....

Edited: the 2nd time it worked. But still struggling to get some programs working again such as SoundID.
 
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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 :)
 
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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. 🙃
 
Apple have somehow broken iPod sync below and including the iPod Gen4 (classic) and related Minis in 15.4 and haven’t bothered to fix it this time around either.

I know, legacy devices and all, but they are working great, and I for one think it’s embarassing for Apple when Windows is now a better platform for using Apple legacy tech.
 
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