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. 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.
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