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bilbowdish
User level: Level 1 (10 points)

Unable to upgrade MacBook Pro to macOS 27

MacBook Pro M4 48GB will not upgrade to system 27. Using Software Upgrade to try to get the upgrade.


[Re-Titled by Moderator]

Original Title: System 27 Upgrade

Posted on Oct 23, 2026 8:47 AM

5 replies

neuroanatomist
User level: Level 9 (72,871 points)

Oct 23, 2026 8:53 AM in response to bilbowdish

If macOS 27.0.1 does not appear in Software Update, try the following steps in order.

  • If you are using a VPN, shut it off.
  • Restart your Mac.
  • Go to System Settings > General > Software Update and check again. Press Command-R to refresh that settings pane, just in case.

 

If macOS 27 still does not appear, you can check which software updates are currently being offered to your Mac.

 

Open Terminal (find the app with Spotlight or in Applications > Utilities) and paste the following, then press return:

softwareupdate --list-full-installers

 

If macOS 27.0.1 appears in that list, you can download the full installer with:

softwareupdate --fetch-full-installer --full-installer-version 27.0.1

 

If you are not offered an update in System Settings and/or are unable to install an update downloaded via Terminal, then is likely that you are in Low data mode. Users have reported difficulty upgrading macOS over Wi-Fi in Low data mode, and that toggling that setting OFF enables them to perform a Software Update. 

 

Turn off Low data mode

  • Open System Settings 
  • Click on Wi-Fi
  • Click on the Details button on the right side of your connected network
  • Toggle the setting off


 

More info from Apple: Wi-Fi settings on Mac - Apple Support

bilbowdish Author
User level: Level 1 (10 points)

Oct 23, 2026 8:59 AM in response to bilbowdish

Low data mode was on. I'll try the upgrade with low data mode off. Thanks.

Mac Jim ID
User level: Level 10 (105,996 points)

Oct 23, 2026 8:50 AM in response to bilbowdish

What is happening when you try in Software Update?


If you are unable to check for updates and using a VPN/Antivirus, then remove it and test again. Turning off a VPN is not likely to solve the problem, it may need to be uninstalled.

Mark_from_Redondo
User level: Level 1 (20 points)

Nov 7, 2026 4:26 PM in response to bilbowdish

@neuroanatomist

Thank you so much for your helpful post. I have looked very many places, including Apple Support, but you are the only one who pointed me to check low data mode setting. You made my day!

neuroanatomist
User level: Level 9 (72,871 points)

Oct 23, 2026 9:00 AM in response to bilbowdish

You're welcome!

Originally posted at discussions.apple.com/thread/256381599