The primary method for accessing these tools is through the Samsung Self-Repair program or authorized service technician software. For newer models like the S21, S22, S23, and S24 series, Samsung provides a calibration executable that runs via a Windows PC connected to the phone. This process ensures that the sensor can accurately read the ridges of a finger through the specific thickness and clarity of the newly installed glass. Without this step, users often encounter the "Fingerprint sensor calibration needed" error message, which prevents any biometric data from being registered.
For certain models, Calibration rubbers are required for calibrating the optical fingerprint sensor. Samsung selfrepair.shop How to Calibrate an Optical Fingerprint Sensor - iFixit samsung fingerprint calibration tool