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Cannot install Big Sur 11.2

Hi foks,

I am trying to install update 11.2 for Big Sur but it fails during the preparing to install stage saying that it cannot download the update. It has actually finished the download. The end of the the install.log file is attached.

Install.log

I think the key part is

[MobileSoftwareUpdateErrorDomain(MSU):MSU_ERR_BRIDGEOS_PERSONALIZATION_FAILURE(44)_1_OSPErrorDomain:201_2_AuthInstallErrorDomain:11], NSUnderlyingError=0x7fa7ab3871c0 {Error Domain=MobileSoftwareUpdateErrorDomain Code=44 "bridgeOS personalization failed" UserInfo={NSUnderlyingError=0x7fa7ab344aa0 {Error Domain=OSPErrorDomain Code=201 "An error occurred during personalization." UserInfo={NSLocalizedDescription=An error occurred during personalization., NSUnderlyingError=0x7fa7ab3dce60 {Error Domain=AuthInstallErrorDomain Code=11 "(null)"}}}, NSLocalizedDescription=bridgeOS personalization failed, target_update=20D64}}}

Does anyone know how the fix this. I have a

MacBook Pro (16-inch, 2019)

2.6 GHz 6-Core Intel Core i7

Think BridgeOS is to do with the T2 chip.

Model Name: Apple T2 Security Chip

Firmware Version: 18P3030

Thanks in advance,

Ian

Posted on Feb 3, 2021 1:15 AM

Top-ranking reply

Encryptor5000

Level 5

7,568 points

Posted on Feb 4, 2021 8:15 PM

Hi Ian,

Thanks for the extensive details! You are correct regarding bridgeOS; that is the hidden operating system running on the T2 Security Chip.

The personalization process contacts Apple servers to sign a per-device request for the update. AFAIK this only happens in the default Full Security boot mode, and most of the time this works fine.

To resolve this issue, I'd first try downloading and running the full macOS Big Sur installer from the Mac App Store. It will automatically include the 11.2 update inside.

If the installer refuses to run, you could try either of the following:

In Recovery Mode, downgrade to Medium Security, install the update, then return to Full Security.
Back up all of your data, then revive the firmware inside the Apple T2 Security Chip.

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Cannot install Big Sur 11.2

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