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The T2 chip is a custom Apple chip that handles the security functions for APFS encrypted storage, TouchID and secure boot. It also integrates other functions like SSD, systems management (SMC) controllers, and well as audio and image processors.

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How to dual boot an iMac 2020, 27", T2 from (Catalina & Mojave)

Your iMac shipped with Catalina. Generally, Apple does not support using an OS older than what the device originally shipped with. Yes, there are the occasional exceptions. Unfortunately, your mode …
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