Before installing the screen,please keep the battery cable connector disconnected.After the new screen is installed,connect the battery cable,then turn it on,check if the screen works normally,ensure the screen is working properly,and install the screen. Install the phone. Tips: ?The tools we provide are uniform and can be adapted to most phones. But there is no guarantee that it will open on all phones. ?Screen replacement parts are very fragile products that must be carefully and gently opened and installed. Be careful not to press it against the edges or corners of the screen. It is easy to break. ?Do not bend the LCD cable too much. If it exceeds 90 degrees, it will be displayed in black. ?If the line is displayed on the screen or the touch does not respond after installation, remove the LCD, clean the connector, and reinstall it. After-sales service For non-human product damage, we offer a free replacement for 3 months. We are not responsible for any damages or malfunctions caused by incorrect installation work. Please use it at your own risk. If you need further assistance with your issue, please email our service team. -Kindly remind: 1.This product does not come with a manual. Please view the tutorials on YouTube before replacing the product. 2.Installation requires a certain amount of knowledge and technique, if you're an amateur, it's better to hire professional services.We are not responsible for damage caused by the installation. 3.It is difficult to deal with problems after installation, please test the product after receive it. 4.If the problem is caused by something other than the LCD panel, replacing the LCD is useless.So be sure to check the cause of your phone's malfunction before buying it.