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A document leak dating back to October indicates that the T2 regulates repairs on the screen, the logic board, the top box and the Touch ID system of the MacBook Pro 2018 and that it has similar control on the logic board and flash memory of the iMac Pro. In theory, you must run a special configuration software suite to successfully repair, limiting repairs to Apple stores or authorized service centers.
Theoretically. iFixit has encountered no blockage when repairing a MacBook Pro, suggesting that the T2 application is not necessarily active or covers a more restricted set of circumstances than some suspicions ( used parts may work, for example). The majority of repairs will not need this tool, Apple said.
Apple could use the T2 chip to limit repairs made by third parties for practical reasons. T2 treats Secure Start Keys and Touch ID fingerprint data, and Apple probably does not want thieves or spies to install parts that can collect this information. That's why you can not easily replace the Touch ID sensor on iOS devices. Quality must also be taken into account: this could prevent an unofficial patch that is insufficient to create headaches for technicians.
However, confirmation is unlikely to appeal to unofficial repair shops or users who want to repair the Mac themselves. They fear that this limits both places where you can go for repairs and potentially leads you to pay more than you need for crucial repairs. There is also the question of how this could conflict with the right to repair laws. Would it not violate these laws effectively by forcing you to turn to Apple or its partners to find a solution? Whatever the reasons that Apple might have this approach, it may have to make compromises in the future.
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