1.9" AMOLED LCD External Screen For Samsung Galaxy Z Flip 4 F721 F7210 F721U/B/N Display Touch Screen Digitizer Replacement

1.9" AMOLED LCD External Screen For Samsung Galaxy Z Flip 4 F721 F7210 F721U/B/N Display Touch Screen Digitizer Replacement 1.When receivedPlease use your motherboard to test before install the screen, install carefully, thanks.(This is very important for the guarantor. Screens are prone to issues. If you notice any issues with the screen you received before installation, please contact us immediately instead of raising a dispute.)2. No installation instructions.(Suggest watching a large number of videos on YouTubePlease ensure that you have sufficient installation experience before installation. Very important.)3. If you want to install, please make sure to do the following first:. Update your Android system first;. Be sure to test before installation;. When connecting the ribbon cable for testing, the system needs to be restarted;. Ensure that there is no static electricity impact (tear off the surface film and cushion the bottom with bubble bags during testing)Must test it before installed,after you install the screen, it is out of warranty.