"Touch ID fails to setup after disassembling iPhones with iOS 10.0.2"に関する回答The iOS version is not an issue with this. Most likely, the touchID chip was shorted out when the flex was disconnected with the battery still attached. You can try replacing the long home flex (which can sometimes be the culprit) but I don't think that will solve your issue. Once that chip is damaged, it's not coming back.
"iPhone 6 is totally dead already checked the battery and the lcd"に関する回答The only other part that could prevent the phone from booting would be the lightning dock connector. If it still won't boot after a new display, battery and dock, then it's most likely a logic board issue and Apple would replace the device for $299US. It also could be a bad display. I've seen all 3 cause an iPhone to not boot.
"How to activate iPhone 7 home button without using finger"に関する回答Any glove that would work with the touchscreen will work with the iPhone 7 home button. It does not need direct skin contact. All that is needed is for the gloves to have capacitive or "conductive" thread sewn into the finger and they will work. They won't unlock a Touch ID enabled device (since it's not your fingerprint) but it will open the device. https://rideapart.com/articles/best-touchscreen-motorcycle-gloves