I failed to install macOS 27 Golden Gate Beta despite trying several times.
The 17GB update downloads successfully, but the installation fails with either:
- “Failed to prepare the software update. Please check your internet connection”
- “Failed to personalise the software update”
My network connection is fine, and I have around 110GB of available storage. So far, I’ve tried:
- Downloading the update again several times
- Fetching the full installer with
softwareupdate --fetch-full-installer - Running
startosinstall - Verifying date and time settings
- Removing Keychain certificates
- Running
sudo nvram -d ota-restorekernel - Waiting and retrying the installation later
I’m using an M4 MacBook Air registered in the Beta program. Has anyone encountered the same problem or found a working fix?