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I followed this tuto and I successfully changed the battery on my iPhone 6 S Plus without any difficulty. But, after then change, touchId feature does not work anymore. Main button is working fine, only touchId feature is faulty: I have a message saying that touchId feature will not be available on the phone.
I wonder if the fact that I disconnected the touchId connector (part of the 3 screen connectors), and reconnected it at the end, may act as the screen itself was changed. Some messages on forums tell that in this case, the iPhone refuses to reactivate touchId feature.
If someone can help it would be great.