![]() ![]() If you downgrade BridgeOS to an older version than the installed OS then macOS Big Sur will not boot and you will be prompted to update BridgeOS from the macOS Update Assistant environment. You will need to downgrade macOS down to 11.2 to support the previous version of BridgeOS. You now want to downgrade to a previous version so you can single out the issue. Something in the new version of bridgeOS is causing problems on your T2 Mac. Why would anyone want to downgrade BridgeOS?Įxample – You updated to macOS Big Sur 11.2.3 from 11.1. ![]() The requirement for BridgeOS downgrade is that you need to satisfy the minimum OS Version or newer. You can downgrade BridgeOS to one previous version (with in 7 days of a new os update) if you are having issues or would like to test the software update mechanism. (Signed = You can upgrade or downgrade) All links are Apple Software Update direct downloads. In the chart below is a list of previous BridgeOS IPSW files along with the signing status. You can now even downgrade BridgeOS on a T2 Mac up to 7 days after an update! You can now upgrade or downgrade BridgeOS with an IPSW file and Apple Configurator 2! You can now upgrade or downgrade BridgeOS on your Intel T2 Mac with an IPSW file & Apple Configurator 2!Īs soon as Apple released the very first T2-equipped Mac, MacAdmins wished that they had a way to downgrade BridgeOS. ![]()
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