Once installed, follow the in-app instructions to run a calibration sequence for the optical sensor.

If the biometric sensor itself was faulty and replaced.

The Samsung Fingerprint Calibration Tool is a vital utility for re-syncing biometric sensors after screen repairs, addressing the "Fingerprint sensor calibration needed" error. Methods include the official Self Repair Assistant app, specialized physical jigs (GH81-25050A), or diagnostic menu resets, with success often depending on using high-quality display parts. For official troubleshooting steps, visit Samsung Support samsungparts