MacOS Golden Gate 27.2 update fails on my MacBook Pro M5 Pro

MacOS Golden Gate 27.2 update is not working on my MacBook Pro M5 Pro

I am on 27.0.1

Tried to install the update through software update 3 times - the process would proceed normally, then it would reboot, then put me back on 27.0.1 without error messages or explanations

The Mac remains on 27.0.1 after five failed 27.2 (26B123) install attempts, each stalling at shutdown and rolling back.

The update engine log reveals the reboot ran in "fail forward" cleanup mode, finished in just 27 seconds, and reported "Failed Backward - in original OS after update was attempted."

Specific errors in the logs are "Failed to personalize the software update"

Has anyone seen this? What could be the cause?

MacBook Pro 16″, macOS 27.0

Posted on Oct 26, 2026 11:20 PM

Top-ranking reply

Nikolaus Heger Author

Level 1

68 points

Posted on Oct 28, 2026 12:24 AM

Resolved it

Turn off lockdown mode

Run the update normally from system preferences

iOS 27.2 installs correctly

Turn lockdown mode back on

This is a bug in MacOS 27.x... when lockdown mode is enabled, updates fail - could be because it doesn't auto-connect to WiFi in lockdown mode, on most Wifi networks. One of the worst features of lockdown mode anyway.

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19 replies

Kapurar

Level 1

32 points

Oct 31, 2026 10:31 AM in response to thatEdem

I suggest you try installing it in Safe Mode. Many of us have had success installing in Safe Mode. Here is the libk to the Apple Support page on starting in Safe Mode.

Start up your Mac in safe mode - Apple Support (CA)

Hope that helps.

Nov 2, 2026 3:42 PM in response to Nikolaus Heger

Nothing works. Suggesting Apple users simply Turn Off Lockdown Mode is irresponsible and completely defeats the purpose of the feature. Apple being the signing authority has no excuse to not disallow software updates because of a security feature. Does this suggest user security is sub factored in the era of ai hot fixes? I don’t know. What I do know for certain this is an apple issue and not yours. This must be fixed by the next update owl.

Oct 27, 2026 5:59 AM in response to Nikolaus Heger

PS: Also updated a MacBook Air from 26.x to 27.2 with no problem, so it's not my internet

osbyrne

Level 1

8 points

Nov 2, 2026 7:26 AM in response to Nikolaus Heger

update from 27.1 to 27.2 fails on my M2 air, despite lockdown mode never being on

it downloads up to 6.21GB, then stalls

I have >30GB free space, so it's probably not a disk issue

MacOS Golden Gate 27.2 update fails on my MacBook Pro M5 Pro