If you're installing a new screen with pre-installed adhesive, follow this step during reassembly. Otherwise, follow this guide to apply adhesive to your old screen.

Thoroughly check the entire screen for any plastic liners or tape and use the pull tabs to remove all of them. Look carefully for a large piece of plastic covering the back of the screen, a small one near the front camera cutout, and adhesive liners around the perimeter.

Reconnect the screen cable and reinstall its cover.

This is a good point to test your phone before sealing it up. Temporarily power on your phone and make sure it works as expected. Power it down before continuing.

Firmly press the screen into place on the frame—you should feel the clips "pop" into place.

Press firmly around the perimeter of the screen to secure it with the new adhesive.

Optionally, you can strengthen the adhesive bond by applying pressure evenly to the phone.

Follow this guide to calibrate the fingerprint sensor.