The is a proprietary, low-level diagnostic utility designed to restore or repair the optical or ultrasonic fingerprint sensors on Samsung Galaxy devices following hardware replacement (e.g., screen, battery, or fingerprint sensor itself). Unlike simple software resets, this tool rewrites unique calibration data—such as gain, offset, and frequency response—that is specific to each individual sensor. Without this tool, a replaced fingerprint sensor will often fail to enroll or recognize prints, showing errors like "Fingerprint sensor not working" or "An error has occurred with the fingerprint sensor."
You can use the "Phone diagnostics" feature within this app to check the health of the fingerprint recognition system.
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