PSA: Installing macOS Golden Gate 27 beta in a UTM VM

source: apple.com

If you’re getting an error trying to install the macOS 27 beta ipsw from developer.apple.com/downloads/os in UTM…

error installing macOS 27 directly in a UTM VM

… I have a solution for you.

Some recommend downloading Xcode 27, installing it, and installing its MobileDevices.pkg and maybe CoreTypes.pkg and a bunch of others. Some report it works, others that it doesn’t.

Here’s what worked for me, on an M1 Max MacBook Pro with macOS 26.5.1:

 

  • Download the macOS Tahoe 26.x ipsw
  • Install it into a new VM in UTM
  • Log in to your developer account in System Settings
  • Update to macOS Golden Gate 27
allowing beta updates in System Settings, source: 9to5mac.com
the upgrade is downloading
the upgrade is installing
macOS Golden Gate 27 is installed and ready to use

Hope it helps : )

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Matthias

I'm a solo, indie software developer, crafting apps for Mac, iPad, iPhone, Apple Watch and Apple TV. I'm responsible for the apps Yoink, ScreenFloat, Transloader, Tameno, DeskMat, Glimpses, flickery, SiriMote, Upsies, BackLog and more.

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