A thread discussing the Galaxy A54 5G highlights this issue perfectly: "It does suggest that fingerprint calibration is required, and unfortunately, this process can only be done at an authorized Samsung Service Center" .
: Calibration is required because the fingerprint sensor is often integrated into or situated beneath the display. Replacing the screen changes the optical properties the sensor relies on to read your fingerprint.
This is the #1 cause of failure.
A fingerprint sensor failure doesn't mean your phone is broken permanently. By utilizing the built-in diagnostic menu ( *#0*# ), cleaning system data, and ensuring your hardware is aligned properly, you can successfully calibrate your Samsung fingerprint sensor back to factory-level accuracy and speed.
| Error Message or Problem | Possible Cause & Solution | | ------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | This is a common issue with some devices, such as the S20FE. The official app may not yet support your phone. Try the CixiTool approach or visit a service center. | | App fails to install, or file appears as a .jar | The downloaded file may have the wrong extension. Rename the file in your phone's "My Files" app by deleting the .jar at the end of its name. It should then appear as an installable .apk. | | Calibration fails, saying "FAILED" | Ensure you are using the correct calibration blocks and applying proper pressure. Also, make sure your phone's battery is sufficiently charged. If the problem persists, it might be a hardware issue. | | "Fingerprint Sensor Calibration Needed" after screen replacement but calibration fails | This can happen with third-party screens that aren't original Samsung parts. Some Galaxy models with unofficial screens may permanently stop the fingerprint sensor from working. | samsung fingerprint calibration tool
You will typically need to use a fingerprint calibration tool if you experience the following after a screen replacement: errors.
To help you find the exact software or steps for your device: What is your (e.g., S23 Ultra, A54)? Did you replace the screen yourself or at a shop? Are you seeing a specific error code ?
Enable on your phone (Settings > About Phone > Software Information > Tap "Build Number" 7 times). Turn on USB Debugging inside the Developer Options menu. Connect your device to the PC.
Third-party screen protectors, especially thick tempered glass or those with dot patterns, can interfere with ultrasonic sensors [Source: 0.5.2]. A thread discussing the Galaxy A54 5G highlights
Fingerprint Sensor Calibration After Android Screen Replacement
It doesn't light up or react to your finger.
Download and open the app from the Galaxy Store. Tap the Support tab at the bottom right. Select Phone Diagnostics . Tap on Fingerprint Recognition .
The trend in the smartphone industry is moving toward tighter integration between hardware and software. Samsung’s push for the Self Repair Assistant is admirable, but the stringent requirements for fingerprint calibration suggest that biometric security is treated as a high-priority, repair-restricted component. This is the #1 cause of failure
A Samsung fingerprint calibration tool is a specialized piece of hardware—often a small, plastic optical calibrator (like the common RL-071B)—combined with specific, sometimes proprietary, software.
It re-aligns the optical sensor with the new display assembly, teaching the phone how to read fingerprints through the new glass.
You often need a calibration rubber/mold (a specialized physical tool) to place on the screen during the software test. 2. Service Menu (Code Dialing)