How to Calibrate an Optical Fingerprint Sensor

Download the Self Repair Assistant app here.

Open the "My Files" app.

Navigate to the "Installation files" tab on the left side of the screen.

Select the app on the right side of the screen.

Select "Install" to confirm the app's installation.

Skip the next two steps.

Navigate to the "Downloads" tab on the left side of the screen.

Long press the download file until an orange checkmark appears to the left of it.

Navigate to the bottom of the screen and select the "More" option.

Select the "Rename" option.

Delete the .jar at the end of the app's name.

Open the Self Repair Assistant app.

Select "Agree" to accept the Terms and Conditions.

Select the "Display" icon.

Select "Continue" at the bottom of the screen.

Select "Start" to begin the fingerprint sensor calibration.

Select "Start" to begin the fingerprint sensor calibration.

Once the screen turns black, select "Start" again.

Place the white box over the outline near the bottom of the screen.

Cover the outline with the side on the box that matches the pattern.

Use your finger to press down on the white box.

While pressing down, use your other hand to select the "Next" icon near the top of the screen.

Continue pressing until the "Calibrating" disappears.

Place the black box over the outline near the bottom of the screen.

Cover the outline with the side on the box that matches the pattern.

Use your finger to press down on the black box.

While pressing down, use your other hand to select the "Next" icon near the top of the screen.

Continue pressing until the "Calibrating" disappears.

Place the side of the small white box with the grooves over the inner portion of the outline near the bottom of the screen.

Use your finger to press down on the small white box.

While pressing down, use your other hand to select the "Next" icon near the top of the screen.

Continue pressing until "Done" appears at the top of the screen.

You may need to reset your device for the calibration to apply.