Maximum Fingerprint Limit Reached after Top-Case Replacement

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

did you find a solution?

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

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.

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

I opened my MBP in intention of reapply a new fresh thermal paste, I shocked that the fingerprint sensor ain’t working eventually.

I’m thinking of a cable or wire isn’t in it’s place as it should be, I definitely think that so, because I find it different than the other stuff.

I'm having the same issue, but I just received a replacement MacBook Pro and restored from a backup. I tried xartutil --erase-all and that doesn't help.

I have the same problem with a MacBook Pro 2016. I tried everything, reinstalled the OS from scratch 3 times, the terminal delete command, and reset SMC and NVRAM. Once it worked for about a day and then it stopped working again. The problem started when I tried adding a fingerprint. Took it to the MacBook service center and they said they couldn't find the issue and that maybe it was the sensor and that the motherboard needed to be changed. That's way too expensive, so I am sticking with the MacBook like it is, everything else works fine, it's just that issue with not being able to use the touch id. And the message saying "Failed" or "fingerprint limit reached". I am sure it's a bug, because as I said it was working fine until I tried adding a fingerprint. And another time after resetting sMC and cram it worked for a day. Any suggestions will be greatly appreciated.