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Hi, Ich replaced the baterry in my iPhone 7, after I closed the phone and booting it, there was written that Touch ID is not working and the Homebutton is not working either. I haven’t touched any parts of the Homebutton while replacing. After another turn of open the Phone there still has nothing happend. What can I try to replace that maybe the Homebutton is working again?

Probably tore the home button/3D Touch cable on the screen, during disassembly, make sure you don’t yank the cable in ANY slightest way, that cable is extremely fragile. Check the cable corners for tear damage, if it is torn, you need to replace the display.