Chosen Solution
So I heard that after replacing the motherboard the original Touch ID won’t work. How can I pair it with the new Touch ID. So that it works with the new mother board. Do I need buy a new Touch ID or can I program the old one to the new one and how do I program it.
You would need the Home button that was originally paired to the replacement logic board, or you would need to get Apple to replace the display so that the home button in the replacement display could be paired with the board. Home button function can be recovered by certain third party home buttons, but touch ID function is something Apple themselves would need to do.
the home button and motherboard as mated/matched/paired at the apple factory. only apple can re-do that programming when they replace the motherboard or home button or both during a repair. the best that you can hope for is to get a 3rd party button (like a YF or JC) and a programmer (like a JC or a Quanli) and copy the ID from the original home button to the replacement button. unfortunately, if it works, the best you can hope for is the home button works and you will only get the Touch ID Unavailable when the phone starts from a reset/power-cycle. if you’re not that lucky you will likely see IOS turning on Assistive Touch on-screen home button all the time (even when you turn it off) for IOS 15.6 and higher.
Apple uses a proprietary encryption algorithm to generate a unique key for each Touch ID fingerprint sensor that guarantees it’s paired to a specific logic board. When you lose the original home button you’ve lost that key; it can’t be read or duplicated. As @flannelist mentioned, the only way to have a working Touch ID is to buy a replacement motherboard and its paired home button. Apple alone can replace a home button; they keep a very tight grip on their encryption algorithm and don’t let anyone but authorized service centers even generate the key and program it into a button. So just to reiterate; if you didn’t buy the home button along with the motherboard, then you won’t get Touch ID working again, period. There are no aftermarket buttons, parts or programmers that will make it work. A trip to the Apple store is the only way to get a Touch ID repaired. I seem to recall you can’t just ask them to replace the home button; that doesn’t seem to be one of their services. If, however, you have the screen replaced, then they’ll also replace the home button and you’d get your Touch ID back. That assumes they’ll even work on it since the logic board has been replaced; if I’m not mistaken they tend to refuse to work on phones that have been repaired by non-Apple persons. There’s also the self-repair program, assuming it supports your phone. Of course, you have to buy the parts from Apple and rent their repair equipment, but it might be possible under those circumstances. Alisha, have I stated these last two paragraphs correctly or am I just blowing smoke out my a$$?
