Any possibility to replace Homebutton AND have Touch ID still working?

"Literally not possible if you replace the button.

It is possible to splice the broken home button back together if you have the skills. However there is no ""chip"" on an iPhone 6 home button. The only chip is the sensor chip fused to the sapphire face of the button, it is not possible to remove the chip from the button or extract any data from it."

I actually got a new one to work , I first disconnected the battery , disconnected the lcd , battery back on let it start up connected to a computer so you know when it has started up , then disconnect battery again , on the lcd disconnect the home button , then reattach the lcd , let it start up then shut it down again , connect the home button again and start up , then shut down and restore in dfu mode , then it will work , it basically rewrites the the code for the home button , I have done this on many many phones now with 100% success , hope it helps

"Not that I have found and I've for sure tried. Best I can figure out is there is a chip in the Touch ID button that is paired with the logic board at the factory. That information is stored somewhere at board level, since a wipe/restore doesn't reset it.

Touch ID is pretty freaking solid security. I'll give Apple a win on this one."

Unfortunately not (that I'm aware of). It is linked to the processor with a unique ID, so if both do not match, touch ID will not work. Apple did this for security reasons.

"There is a way to keep the touch ID when reparing a iPhone home button. I refurbish phones and sell then on eBay. I have a bunch of home buttons and mixed them up and needed to find the right home button for the phone I was working on. I called Apple and they told me it could be done, but never got to tell me how, because I had to hang up and really I just thought the representative didn't know what she was talking about.

Well, that night I was fixing a phone with a black screen and just grab any button to test it and I put the phone in recovery mode and after I started to set it up the finger scan didn't fail and I was able to use the Touch ID. The they was I had used a white button and the Touch ID was working and it couldn't have been the original since my screen was a black screen. I called Apple again and was told that yes it should work. What the rep explained to me was that some companies don't put the correct hardware on the home buttons they sell to save money, but if you purchase a quality one it will be able to reset the Touch ID to work by doing a full system restore in DFU mode. So who knew you can restore the Touch ID it just depends on the home button you purchased. They did say that the Apple Store and Best Buy can repare it for you and keep your Touch ID."

"Don’t ask how I found this out, but the chip in “official” TouchID buttons isn’t actually OTP after all.

Its actually an e2prom but with the external write voltage line routed through a cell fuse so when written it gets “Zapped” and goes open circuit or at least very high resistance in order that any attempt to rewrite it would then fail.

The way to fix this would be wiping the chip with X-rays. Needless to say it would be dangerous but UV light may work as it has done with many smaller chips of which this is likely to be. Cell size is probably in the micrometre range so should be feasible with something like a Cool-X or similar."