If you are not sure or don't know how to install, please contact us for installing instructions or assembling by the professional person.
We don't accept any dispute about the motherboard used or second-hand, thank you for understanding.
It's important to note that each iPhone's logic board and Touch ID fingerprint sensor are paired at the factory, so replacing the logic board will disable Touch ID unless you also install a replacement home button that has been properly paired to your new logic board. If you want to keep the fingerprint function please select the board with touch ID.