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Touch ID pairing - Self Service Repair

I am a little confused by the Self-Service Repairs from Apple, and what is and isn't possible.

When I attach a second hand screen (genuine Apple) it gives me the option to finish the repair and it calibrates accordingly.

When I try a second hand Touch ID (genuine Apple) it fails to recognise it as being a genuine part.

My questions are - is it possible to calibrate a Touch ID now through Apple's program? And if so, would I need to buy a new button through the Self-Service Repair from Apple?

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I was going through the self repair program information, and every indication is that the Repair Assistant seems to be able to recalibrate a Touch ID board, at least one purchased from Apple. They don't differentiate that repair from any other one they talk about, so I don't know if there is some restriction on only working on one you bought directly from Apple vs. a used part, but it does specifically mention repairing Touch ID on the M1 MacBook Air.

Mac Laptops Troubleshooting Input/Output Issues - Apple Support

Here's the part they're selling; I assume that's what you're replacing.

Self Service Repair Store

They actually show the repair assistant popping up for a new Touch ID board on their guide to invoking it.

Use Repair Assistant to finish a Mac repair - Apple Support

At this point we're really only guessing; only Apple can authoritatively answer the question of why you can't seem to calibrate a used Touch ID board since they show that process in operation. @flannelist Alisha, do you have any thoughts on this?

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Only a new virgin TouchID button and as far as I know only installed by Apple and the data on the drive is lost

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You are mixing different aspects of Apples Security

Parts Serialization - To kill off knock off parts (not a real issue) - Using the re-serialization (calibration tool) which only works with real Apple parts.

TouchID - Systems data security - The TouchID is married to the its mated logic board and no other!

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alasdair Sim 将永远感激不已
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