The Xiaomi 9C fingerprint scanner (also known as the Redmi 9C) is not just a convenient way to unlock, but also an additional layer of personal data protection. However, many users face problems when first setting up: the sensor does not recognize the finger, the system gives an error, or the fingerprint is saved, but works every time. In this article, we will discuss the step-by-step process of adding a fingerprint, typical errors and how to fix them.
It’s important to understand that the Xiaomi 9C has a rear physical scanner (as opposed to the on-screen sensors in flagships), which affects how you record your fingerprint. For example, too wet or dirty fingers can interfere with the correct reading, and we’ll also show you how to increase recognition accuracy by 30% if the sensor is unstable.
Preparing the phone before setting up
Before you add a fingerprint, make sure your Xiaomi 9C is ready for the procedure.
- 🔋 Battery charge at least 20%. With low charge, the system can interrupt the process.
- 🧼 Clean the sensor and finger, wipe the scanner with a dry wipe, and wash your hands with soap.
- 🔒 Installed PIN-It's a code or a pattern lock. You can't add a print without it.
- 📱 Updated software. Old versions. MIUI There are scanner bugs.
If you just bought a phone, set it up first. PIN-code → Lockdown and protection → Lock the screen. Without this add-on menu item, the print will be inactive.
⚠️ Warning: If you reset your phone to the factory settings, all the fingerprints you saved will be deleted.
Step-by-step: how to add a fingerprint
Now, let's get to the main process. Follow the instructions carefully to avoid errors.
- Open Settings (the gear icon on the main screen).
- Go to the section Lock and Protection.
- Select fingerprints.
- Enter the current one. PIN-code or pattern lock for confirmation.
- Press Add Fingerprint.
- Place your finger on the scanner (it's on the back of the camera). Hold it until it vibrates.
- Raise your finger and repeat the action by changing the angle of touch, and the system will ask you to raise and lower your finger 6-8 times.
- After a successful scan, name the fingerprint (for example, “Indicative Right”) and click Ready.
Important: Don't press the sensor too hard, it can distort the reading, and the optimal pressure is just like a light touch on the screen.
Check the battery charge
Make sure your finger is dry and clean.
Install. PIN-code
Update. MIUI last-minute-->
Typical errors and their solutions
Even with the right setup, Xiaomi 9C users sometimes run into problems.
| Problem. | Possible cause | Decision |
|---|---|---|
| Sensor doesn't respond to touch | Dirt on the scanner or wet hands | Wipe the sensor with an alcohol napkin, dry your hands |
| No prints are saved. | Finger removal too fast | Hold your finger until vibration (1–2 seconds) |
| Recognition works in a time. | Insufficient number of scans when added | Remove the fingerprint and add again by changing the angle of the finger. |
| Error "Can't add a fingerprint" | System failure or outdated firmware | Reboot your phone or update your MIUI |
If none of the solutions worked, try resetting the scanner settings, and delete all the fingerprints you saved and add them again.
Always.
Often, but sometimes I use a PIN.
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Never, just PIN/graphics-->
How to Improve Accuracy of Recognition
If the Xiaomi 9C scanner is unstable, try these methods:
- 🔄 Add the same finger twice at different angles, such as "Indicative Right" and "Indicative Right (side»).
- 🧴 Use hand cream before scanning – this improves contact with the sensor.
- 📱 Turn off "Open Up" in the screen settings. Sometimes it interferes with the scanner.
- 🔋 Recalibrate the sensor through the engineering menu (requires root rights).
Also check if the phone has a glass shield with a cutout under the scanner, which sometimes interferes with the correct reading.
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If the print is not recognized in winter, warm your hands before unlocking – cold reduces the sensitivity of the skin.
Fingerprint removal and management
To delete or rename the saved print:
- Go to Settings → Lock and Protection → Fingerprints.
- Enter. PIN-proof-code.
- Click on the desired print in the list.
- Choose Remove or Rename.
On the Xiaomi 9C, you can save up to 5 fingerprints, which is convenient if you have multiple people using the phone or you want to add different fingerprints.
⚠️ Attention: When you reset your phone to factory settings, all the fingerprints are automatically deleted.
Security: Can the scanner be fooled?
Many users are worried about how reliable the fingerprint scanner on the Xiaomi 9C is.
- 🔐 The sensor on this phone is optical, not ultrasonic, which means it's less secure from counterfeiting.
- 📸 In theory, a high-quality high-resolution print photo can fool the scanner, but in practice it is unlikely.
- 💳 Payments (e.g. via Google Pay) require confirmation PIN-code, even if the print is configured.
If you want maximum security, combine the print with PIN-It is also recommended to disable the unlocking fingerprint for the Safe folder in the MIUI, If confidential data is stored there.
How to check if the fingerprint is stored in the system?
Frequent questions and answers
The scanner stopped working after the MIUI update.
Can I use a fingerprint to log in to applications?
Why is the scanner slower than the new Xiaomi models?
Can I transfer my fingerprints to another Xiaomi phone?
💡
For maximum reliability, add the same finger twice at different angles, which will increase the accuracy of recognition by 30-40%.