Скачать или смотреть Big Sur RC2 Full Install & Upgrade on a T2 Mac = “An error occurred installing macOS”

UPDATE 11/12/20!! For the new installer issues I've created a new video!    • macOS Big Sur 11.0.1 Final Installation Fa...  

THIS IS THE PREVIOUS RC2 Install problems Video! When you attempt to install or upgrade on a T2 Mac, you will get the error - "An error occurred installing macOS. You can try again to complete the installation". in the install.log you will see “The bridgeOS update doesn’t satisfy the given minimum version requirement.”
Almost immediately after macOS Big Sur 11.0.1 (20B28) was released, I started to see reports of install issues. This was only happening on T2 Macs that need a BridgeOS update. A BridgeOS update is included and required with almost every combo, delta and full installer upgrade or install. Below is the 11.0.1 RC2 Install error.

The problem is the new production Software Update Catalog URL does not have the needed BridgeOS update yet.

The problem comes down to the installer looking to the new production SUS url. Apple just made the production SUS catalog available. The new URL is

New Big Sur Production SUS URL =

https://swscan.apple.com/content/cata...

Big Sur Beta SUS URL =

https://swscan.apple.com/content/cata...

The production URL does NOT include the required BridgeOS update needed for the Big Sur RC2 installer to continue.

Notice this line

“The bridgeOS update doesn’t satisfy the given minimum version requirement.” UserInfo={bridgeVersion=17.16.16610.0.0,0, minimumVersion=18.16.12561.0.0,0, catalogURL=https://swscan.apple.com/content/cata...

I track all T2 BridgeOS updates here

mrmacintosh.com/macos-system-status-version-info-for-macadmins

This is what the new Big Sur 11 production SUS looks like right now.

Set the SUS server to the DeveloperSeed SUS URL.

To resolve this issue we can use the nvram binary to set the SUS catalog to the correct one that has the BridgeOS update that we need.

sudo nvram IASUCatalogURL=https://swscan.apple.com/content/cata...

You can use sudo nvram -p to view all the nvram settings.

NOTE! When you are done with the upgrade, don’t forget to remove the value!

sudo nvram -d IASUCatalogURL

Links
https://MrMacintosh.com - Apple Mac Enterprise IT Blog & macOS News for MacAdmins

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