For privacy reasons I always delete BridgeAudioController.kext on a Mac. This away, the built-in mic will stop working and nothing can access my mic. If I need it I'll just use an headset.
In MacOS Catalina this was relatively simple:
- Start recovery with external boot disk so I can prevent the internal macOS from launching;
- Launch terminal;
- rm -rf /System/Library/Extensions/BridgeAudioController.kext
The clever move is to prevent the internal macOS from launching because, if it does, BridgeAudioController.kext will be marked has read-only by the system and just can't be deleted (even if the SIP is turned disabled). For Catalina a similar situation is described by @user3439894 in this post: How to delete kexts in Catalina?
The Problem is that Big Sur external boot disks no longer include terminal. Access to terminal can only be made through MacOS recovery / Options.
Any ideas on how to bypass this? Thanks in advance,