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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