Apple’s T2 chip will block some third-party repairs of new devices

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Apple also informed that the T2 chip is very crucial for the working of the modern Macs as they facilitate some of the most critical functions like storing the keys used for securely booting the Mac, processing the TouchID inputs, enabling the MacBook Pro to respond to Hey Siri questions and it also protects the microphone on the laptop to be used by hackers when the lid is closed. Also, Apple hasn't told whether this is a new policy or it was in place ever since the T2 chip debuted on its gadgets. Apple has now confirmed that it blocks certain third-party repairs on these newer Mac devices with the T2 Security Chip, forcing the user to get them repaired from an Apple Store or an Apple Authorised Service Provider.

It's now officially confirmed by Apple that the T2 chip performs a series of diagnostics on the first boot after a certain component has been changed and if it finds unauthorized hardware, it bricks the whole device making it unrepairable.

The T2 needs to detect an Apple specific diagnostic tool to be able to run the computer after the logic board or anything related to Touch ID is replaced. A negative feedback from the GSX server renders the machine inoperable.

In an email to The Verge, iFixit CEO Kyle Weins opined that "the T2 is a guillotine that [Apple is] holding over product owners".

"It's possible the goal is to exert more control over who can perform repairs by limiting access to parts", Wiens said. Or it could be a threat to keep their authorized network in line. And while only the MacBook Pro and iMac are specifically named in Apple's internal documents, it's likely that the new MacBook Air and Mac Mini will soon be included in that list. Apple internal documents say technicians should run AST2 for any fix that touches the display assembly, logic board, top case, or Touch ID board.

At the heart of the contention is Apple's new second hear, the security-oriented T2 co-processor.

However, it seems that this "kill switch" isn't active yet, at least as of last month. Probably a future software update might make AST2 diagnostics mandatory for repairs, we do not know.

The custom T2 chip is integrated with the logic board on all Macs from the late 2017 iMac Pro forward.

This program, called "AST 2 System Configuration", works in conjunction with the T2 security chip.

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