Launch the tool on your PC and connect your device via a high-quality USB-C cable.

Ensure the ribbon cable for the fingerprint sensor is fully seated and not kinked during installation.

New glass has different light transmission properties (for optical sensors) or acoustic impedances (for ultrasonic sensors). Calibration tunes the sensor to "see" through the specific piece of glass installed. How to Access the Calibration Tool

Even a thin plastic film can cause calibration to fail. Remove it.

If you are using the official calibration firmware/software, the process generally looks like this:

Samsung Fingerprint Calibration Tool: A Complete Guide If you’ve recently replaced the screen on your Samsung Galaxy device, you might have encountered a frustrating "Fingerprint sensor needs calibration" error. Because modern Samsung phones use sophisticated under-display sensors (either optical or ultrasonic), the hardware must be digitally aligned with the new display panel to function securely.

For newer models (S20 series and later), Samsung provides a "Self-Repair Assistant" or "Samsung Repair Assistant" app, often used in conjunction with a Windows PC. Connect your phone to a PC.

If the option to add a fingerprint is missing from your settings menu entirely, the phone has likely failed its "Power-On Self-Test" (POST) for the sensor. Re-running the calibration tool can often "wake up" the hardware. Verdict: Can You Do It Yourself?

Always back up your phone before running calibration tools, as they sometimes require a factory reset or "Repair Mode."

Follow the on-screen prompts to "register" the new hardware. 2. The Hidden Service Menu