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모델명 A1707. 2017년 6월 출시, 이 MacBook Pro는 Kaby Lake 프로세서 최대 2.8 GHz 쿼드코어 Intel Core i7 프로세서와 Turbo Boost 최대 3.8 GHz를 사용합니다.

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Maximum Fingerprint Limit Reached after Top-Case Replacement

I have this Macbook Pro 15 inch Touch-bar 2017, I swapped the top case to fix my keyboard, all features working perfect when I started (except the keyboard, that’s the reason I did it.)

After I completed the task, all features function, except that my Power Button (with Touch ID) keeps saying Maximum Fingerprint Limit Reached.

Things I tried:

  • Boot into Recovery and use the Terminal to xartutil —erase-all
  • Removed Fingerprints from my iPhone which uses the Same Apple ID.
  • Added new Fingerprints using my iPhone which uses the same Apple ID.
  • Reinstalled the OS.
  • Did not harm the Enclave or logic board to the best of my knowledge.

Apple isn’t interested in replacing my logicboard for free, they identified the top-case as replaced.

답변되었습니다! 답변 보기 저도 같은 문제를 겪고 있습니다

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Did you transfer the touch sensor from your old case to the new one? Was it damaged?

Don't understand why you messed with your iPhone, the fingerprints are not transferred between your systems.

FYI: Use Touch ID on your Mac

I have the same problem. I had my mother board replaced due to USB C port problem. when I got my Mac Book back the fingerprint function said "Fingerprint limit reached.... To add a new fingerprint, remove a fingerprint from any account on this Mac." but there are no other accounts on my Mac... not a big deal, but it frustrates me and id like to get the fingerprint function working again... any suggestions....?

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선택된 해법

Reboot your Mac into Recovery mode and use the Terminal to type in a command. Here’s how.

  • Restart or start your Mac.
  • While your Mac restarts, hold down Command + R until you see the Apple logo appear.
  • When it does, release the keys. Your Mac will now enter Recovery mode — you should see a macOS Utilities pane.
  • Click on Utilities in the top menu bar.
  • Select Terminal.
  • Once it opens, type the following command into the terminal: xartutil –erase-all
  • Press Enter / Return.
  • Type yes into the terminal.

Once all of that is done, you should be good. Just click the Apple icon in the top menu bar and select Restart.

From here, just go back to the Touch ID pane in System Preferences and try adding new fingerprints.

What if This Doesn’t Work?

This should work in the vast majority of cases. But it’s worth noting that some users have had the fingerprint bug persist even after the Terminal command.

If that’s the case, it’s recommended that you take your MacBook Pro into Apple or an Authorized Service Provider for diagnostics and possible repairs. There could be another issue at play.

Similarly, it’s pretty likely that Apple is aware of this bug and is working on a fix that a might do away with the disconnect between macOS and the Secure Enclave.

Because of that, just make sure to keep your MacBook Pro up-to-date by installing the latest macOS software updates.

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Hi :) I've had Apple "repair" my MacBook Pro several times. Since yesterday, I got the same issue and tried this solution. However, when I rebooted and tried to log in to my account (the only one on this Mac), it said my password was wrong. I then tried to format the hard drive again using an external usb drive, which did not work. 3 hours of talking to Apple and trying to get a fresh macOS up and running...

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this does not work for T2-equipped Macs. After the erase the SSD volume gets unmountable.

To make it mountable again you’ll need to delete it and re-create.

Restoring from TimeMachine returns back to the fingerprints issue.


Re-install the system from scratch is not an option I would like to follow. Too much of installation and configuration required

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Time to visit an Apple Store or an Apple authorized service center for diagnostics and possible repairs.

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did you find a solution?

I encountered the same problem … the xartutil —erase-all did not to the trick. :/

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I went to the service center. and replaced motherboard.

no other solution.

got it repaired for free (still on warranty), so I assume Apple does not have another solution

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So, I had a similar issue and did everything that the above mentioned. I went digging into the Apple Documentation and also to an Apple Store to speak to a Genius and this is what I found:

  • When doing a replacement/swap of the top case and/or Touch ID sensor, it needs to be logged into AST 2 as being performed by an Apple Tech or Certified Apple Repair Facility
  • The reason for the above is because the Touch ID needs to be “Serialized” to the new/existing motherboard (i.e. if you kept your motherboard but got a new top case or Touch ID, only a certified repair can initialize the secure enclave within the Touch ID sensor)
  • The power button/function will still work, but the security of the Touch ID will not work until you serialize it
  • The only way to “initialize/serialize” the Touch ID is by running a diagnostic/serialization via AST2
  • AST 2 can only run the serialization if it has both the old and new serial numbers (i.e. if replacing the top case, you need the top case serial number of both top cases)
  • Only certified techs can run the tool via the AST 2

So…that being said, if the process wasn’t done via AST 2 with a certified repair facility, chances are on T2 macs, the touch ID won’t work. This removes the function of “right to repair” as you cannot replace the sensor/button on your own without having to go to a certified facility to do the repair there.

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Nathan - If you had used a different TouchID than the one that the system being repaired had on it then yes you are correct! But, you can swap-out the buttons so the original button which is ID'd to the logic board is still with the logic board you won't have a problem!

I've done it without any issues, still a delicate repair as the ribbon cable can be damaged very easily when swapping it over! If the button is damaged then all bets are off!

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So, in my case I clean installed macOS 4 times (once when Catalina came out and 3 times trying to fix a display issue) and finally turned it in for repair. Apple clean installed Catalina again and gave it back to me. But all the time, the fingerprint was left in the storage and so Touch ID wouldn’t work any longer. I took it back to the store and they couldn’t do anything about it but swapping the entire board. This fixed the Touch ID issue since there was a new T2 controller on that new board and also finally fixed my display issue

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