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macOS Tahoe 26.4 Beta 2 - 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

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Release Date ― 23 February 2026
Build Number ― 25E5218f
Apple Silicon System Firmware Version ― mBoot-18000.100.10.0.1
T2 BridgeOS System Firmware Version ― 23.16.14224.5.2
New Features & Changes (Found something new? Please press "Edit" on the bottom of this post and add it here)
Resolved Issues
New Issues
(If you are encountering any issues, please press "Edit" on the bottom of this post and add it here)
Remaining Issues
  • When filling your screen with the App Store, the title of the View may be wider than expected
  • On non notched devices, the volume indicator may have excessive padding in full screen (Present since 26.2 Beta 3)
  • 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
Untested Issues
  • Some major graphical issues may be present in this beta.
    • Present since (26.3 Beta 3)
  • Karabiner Elements seems to not be able to load Virtual Keyboard Driver and this all keyboard remapping doesn't work.
  • Getting Apple Webkit crashes in Safari all day long
    • Issue Present since macOS 26.4 Beta 1
  • HFS external drives may not mount (workaround: use 'diskutil mount' command in Terminal)
  • DMG disk images may not mount (workaround: use 'hdutil attach' command in Terminal)
  • 12-Hour times is displaying noon times as 00:00PM - 00:59PM instead of 12:00PM to 12:59PM
    • This is NOT fixed, will somebody help me and report this?
    • This doesn't seem to be an issue for anyone else...
  • Clipboard History always enabled after rebooting
  • More macOS 26.3 Finder column view silliness
  • Scroll bar is cut off on the bottom-right in Spotlight and System Settings
Additional Notes
  • Updates might not show up in Settings as soon as it releases if you have Rosetta 2 installed.
  • If you are encountering a memory management issue (eg. a Memory Leak), please provide what app/process it is coming from (Using Activity Monitor) and what you were doing in that app.
  • 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 26 Tahoe will be installed via a Delta Update in System Settings. Please be aware about this, as the update won’t install with an installer.
  • macOS 26 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 26, including bugs should be discussed in this thread.
    • MacBook Air: M1, M2, M3, M4
    • MacBook Pro: 2019 (16 Inch only), Intel 2020 (4 thunderbolt port only), M1, M1 Pro/M1 Max, M2, M2 Pro/M2 Max, M3/M3 Pro/M3 Max, M4/M4 Pro/M4 Max, M5
    • Mac mini: M1, M2/M2 Pro, M4/M4 Pro
    • iMac: 5K 2020, M1, M3, M4
    • Mac Pro: 2019, M2 Ultra
    • Mac Studio: M1 Max/Ultra, M2 Max/Ultra, M3 Ultra, M4 Max
  • macOS Tahoe 26.4 Release Notes
  • macOS Tahoe Overview
  • Apple Security Updates
  • Become an Apple Beta Tester
  • Full Installer (Direct Download)
 
Last edited:
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bogdanw said:
It's 1.89 GB https://theapplewiki.com/wiki/Beta_OTA_Updates/Mac/26.4
I miss the days of the Combo Update DMGs 🙂
Click to expand...
Screenshot 2026-02-23 at 20.00.53.png


It's different for every kind of Mac. This is on my M4 Pro mini.

My edit was interrupted by the reboot.

Thanks for that website. The zip-file there is 3.5 GB for my Mac.

The full installer suitable for all Macs to update usually will be released one or two days later, often together with the public beta.
 
Last edited:
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It looks like when using compact tabs, the close button X on the tab is now left-aligned instead of being centered.
I kept closing tabs on beta 1 by accident because the X button kept moving depending on the length of the website title in the tab. 😅
 
Screenshot 2026-02-23 at 20.28.46.png


I found a change, mBoot in the firmware version.

Can anyone with T2 confirm if there is a change too, iBoot maybe? I only was able to see the number in here:

<dict>
<key>ServerMetadataURL</key>
<string>https://swcdn.apple.com/content/dow...2jkjomjprbnl9h0u4h/BridgeOSUpdateCustomer.smd</string>
<key>Packages</key>
<array>
<dict>
<key>Digest</key>
<string>c225d82178e729d1439b80ee50ab60e33972e833</string>
<key>Size</key>
<integer>1704777</integer>
<key>IntegrityDataURL</key>
<string>https://swcdn.apple.com/content/dow...prbnl9h0u4h/BridgeOSBrain.pkg.integrityDataV1</string>
<key>MetadataURL</key>
<string>https://swdist.apple.com/content/do...k9ynl7qdc2jkjomjprbnl9h0u4h/BridgeOSBrain.pkm</string>
<key>URL</key>
<string>https://swcdn.apple.com/content/dow...k9ynl7qdc2jkjomjprbnl9h0u4h/BridgeOSBrain.pkg</string>
<key>IntegrityDataSize</key>
<integer>104</integer>
</dict>
<dict>
<key>Digest</key>
<string>365baec3c73bd3d1682e70eb4c16a16d5d9fed09</string>
<key>Size</key>
<integer>574502385</integer>
<key>IntegrityDataURL</key>
<string>https://swcdn.apple.com/content/dow...4h/BridgeOSUpdateCustomer.pkg.integrityDataV1</string>
<key>MetadataURL</key>
<string>https://swdist.apple.com/content/do...2jkjomjprbnl9h0u4h/BridgeOSUpdateCustomer.pkm</string>
<key>URL</key>
<string>https://swcdn.apple.com/content/dow...2jkjomjprbnl9h0u4h/BridgeOSUpdateCustomer.pkg</string>
<key>IntegrityDataSize</key>
<integer>2048</integer>
</dict>
</array>
<key>ExtendedMetaInfo</key>
<dict>
<key>ProductType</key>
<string>bridgeOS</string>
<key>BridgeOSPredicateProductOrdering</key>
<string>23.16.14224.5.2</string>
<key>BridgeOSSoftwareUpdateEventRecordingServiceURL</key>
<string>https://xp.apple.com/report</string>
<key>ProductVersion</key>
<string>26.4</string>
 
Last edited:
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The biggest question: Is HFS+ fixed? I can't test it anymore.

Edit: Oh I forgot, much more important, are the new emojis there now? 🙈 I don't even know what the new ones are but I heard they were not included in Beta 1 yet.
 
Adora said:
The biggest question: Is HFS+ fixed? I can't test it anymore.

Edit: Oh I forgot, much more important, are the new emojis there now? 🙈 I don't even know what the new ones are but I heard they were not included in Beta 1 yet.
Click to expand...
Nope to both it looks like
 
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Installed on M1 Ultra Mac Studio no problem, but on my M3 MacBook Pro it keeps failing while preparing with 5 minutes remaining. Rebooted and tried again, same thing. Anyone else?
 
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moebis said:
Installed on M1 Ultra Mac Studio no problem, but on my M3 MacBook Pro it keeps failing while preparing with 5 minutes remaining. Rebooted and tried again, same thing. Anyone else?
Click to expand...

How long did you wait? That time indicator is really bad. For me it's always much shorter then displayed. But could also be longer.
 
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Adora said:
How long did you wait? That time indicator is really bad. For me it's always much shorter then displayed. But could also be longer.
Click to expand...
I waited as long as it took for the error message to pop up and stop the install. Looks like it might have something to do with Rosetta update. One time it showed an error with that and I can see in the /Library/Updates folder an update there. I can't even "sudo rm -rf /Library/Updates/*" that directory, it's got a giant lock icon on it. I even tried to kill the "softwareupdated" process but permission was denied also.
 
moebis said:
I waited as long as it took for the error message to pop up and stop the install. Looks like it might have something to do with Rosetta update. One time it showed an error with that and I can see in the /Library/Updates folder an update there. I can't even "sudo rm -rf /Library/Updates/*" that directory, it's got a giant lock icon on it. I even tried to kill the "softwareupdated" process but permission was denied also.
Click to expand...

I think you need to disable SIP. I have no problem deleting the complete folder:

Screenshot 2026-02-23 at 21.17.35.png


I wonder why the Rosetta update even still is in there...

Screenshot 2026-02-23 at 21.19.01.png
 
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