The difference here is that Apple WILL stop signing for previous versions of BridgeOS. We can then use the BridgeOS IPSW File to restore/revive BridgeOS to your T2 Mac. We can now download full BridgeOS IPSW Files directly from Apple the same way we do now with Apple Silicon M1 Macs. I’ve also talked about downgrading BridgeOS before, but this was ONLY for beta versions of BridgeOS to get back to production/final versions.Īpple Configurator took care of all the work in both above examples, downloading the prod/final version of BridgeOS for your hardware. You could always upgrade BridgeOS via automatic download with Apple Configurator 2.
MACOS BIG SUR DOWNGRADE UPDATE
Now you want to downgrade to a previous version of BridgeOS so you can single out an issue or test the full update process again. Set this Mac on the shelf because you will never be able to take it through a full update process again until 11.5.
MACOS BIG SUR DOWNGRADE INSTALL
Even if you boot back to recovery and install 11.3, BridgeOS will remain the same updated version. Now that this T2 Mac is on the latest version of BridgeOS it normally can not be downgraded. An example of this is if you upgrade a T2 Mac from 11.3 to 11.4.
Part of that macOS Update process is updating BridgeOS. If you are a system administrator in charge of updating a large fleet of Mac testing is very important. Now you thinking that the new version of bridgeOS might be causing problems on your T2 Mac. So in this example, maybe you are getting audio cracking noise (has happened in the past). The T2 chip handles many things including, fan speed, battery, power, charging & sound (speakers & microphone). After the update, you’ve found that something is not working right. You updated to macOS Big Sur 11.4 from 11.3. Let’s go over a quick example of why you might want to downgrade BridgeOS. Why would anyone want to downgrade BridgeOS? Downgrading BridgeOS for troubleshooting & macOS Update workflow testing. Updating BridgeOS on a T2 Mac was a one way street. Softwareupdate -fetch-full-installer -full-installer-version 12.6.You can now downgrade T2 BridgeOS with an IPSW file and Apple Configurator 2 (for up to one week after the release of a new macOS update) You can now downgrade BridgeOS on your T2 Intel Mac (2017-2020) to a previous version with Apple Configurator 2!Įver since Apple released the very first T2 equipped Mac, some users wished that they had a way to downgrade to the previous version of BridgeOS.
On the Mac you want to upgrade to Monterey, do one of the following: There are two easy ways to download the full installer for macOS Monterey. Step 1: Download the full macOS Monterey installer on the Mac you want to upgrade. The easiest way to upgrade directly to a specific release of MacOS is to download the full installer for the version of system software you want to run and upgrade directly to it.
MACOS BIG SUR DOWNGRADE HOW TO
How to downgrade from older macOS (Catalina, Mojave, Big Sur) to macOS Monterey (and avoid Ventura)
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