Relife RL-071B Optical Fingerprint Calibrator for Android

Relife RL-071B 4-in-1 Fingerprint Calibrator | Android Repair Tool

The Relife RL-071B is a professional-grade optical fingerprint calibration tool engineered for mobile repair technicians. After replacing the display on a modern Android smartphone, the in-display optical fingerprint sensor commonly loses its calibration — causing slow recognition, failed authentication, or complete sensor failure. The RL-071B corrects this without opening the phone again. As an upgraded 4-in-1 solution over the original RL-071, this model supports a wider range of device sizes and brand-specific calibration blocks, making it the go-to tool for busy repair shops handling Huawei, Xiaomi, OPPO, and VIVO devices with under-screen fingerprint sensors.

Features

• ✦ 4-in-1 calibration blocks
• Includes four interchangeable calibration blocks to cover different screen sizes and brand-specific sensor positions in a single kit.
• ✦ No-disassembly design
• Performs full optical fingerprint re-calibration externally — no need to re-open the device, saving significant time per repair job.
• ✦ High recognition rate
• Real-machine tested to restore optimal fingerprint recognition accuracy post screen-swap, even on sensitive under-display optical sensors.
• ✦ Software + tutorial guided
• Works with brand-specific service mode codes and optional companion software — step-by-step video tutorials available for quick onboarding.
• ✦ Compact and portable
• Lightweight tool small enough to fit in any repair toolkit or apron pocket — ideal for on-site technicians and mobile repair vans.

Technical specifications

Compatibility

Compatible with Android smartphones featuring under-display optical fingerprint sensors.

Supported brands:

• Huawei — P30, P40, Mate 30, Mate 40, Nova 5, Nova 7 series (use with calibration software)
• Xiaomi / MI — Mi 9, Mi 10, Mi 11, Redmi K20 Pro, K30 Pro, K40 series (service code: *#*#6484#*#*)
• OPPO — Find X2, Find X3, Reno 3/4/5 Pro, A series optical models (service code: *#899# or 6776)
• VIVO — X50, X60, X70, S7, S9, V20 Pro, Y series in-display models (service code: *#64663#*)
• Samsung — select models with optical in-display sensor

Note: Only compatible with optical under-display fingerprint sensors. Capacitive side-mounted or rear fingerprint sensors are not supported.

How to use

• Step 1 — Complete screen replacement
• Fully assemble the phone with the new screen before using the calibrator. The device must be powered on and functional.
• Step 2 — Enter service / engineer mode
• Dial the brand-specific service code on the device to access the fingerprint calibration menu. Codes vary by brand (see compatibility section).
• Step 3 — Select the correct calibration block
• Choose the matching block from the 4-in-1 set according to the device brand and model. Refer to the included guide or online tutorial.
• Step 4 — Place calibrator over the sensor area
• Position the RL-071B on the screen directly over the fingerprint sensor zone. The device's optical sensor will read through the calibration block.
• Step 5 — Run calibration and verify
• Initiate the calibration sequence in the software menu. The tool completes the calibration and the fingerprint sensor is restored for normal use.

What's in the box

• 1x RL-071B main calibration platform
• 4x brand-specific interchangeable calibration blocks

FAQs

• Q: Does the RL-071B work on iPhones or any iOS device?
• A: No. The RL-071B is designed exclusively for Android smartphones with under-display optical fingerprint sensors. Apple devices use a different authentication architecture and are not compatible.
• Q: Is this tool the same as the original RL-071?
• A: The RL-071B is the upgraded version of the RL-071. The "B" variant includes four calibration blocks (4-in-1) covering more device sizes and models, whereas the original RL-071 shipped with fewer heads. If you're buying new, the RL-071B is the recommended version.
• Q: Do I need special software to use this tool?
• A: For most brands (Xiaomi, OPPO, VIVO), you enter the device's built-in service mode via a dial code. Huawei devices may require additional calibration software. Detailed video tutorials are available online.
• Q: Will this fix fingerprint issues caused by software updates?
• A: The RL-071B is specifically designed to restore fingerprint function following a physical screen replacement. It is not intended to resolve software bugs, corrupted firmware, or hardware defects unrelated to screen swaps.
• Q: How long does calibration take?
• A: The calibration process typically takes between 1 and 3 minutes per device once the tool is correctly positioned and the service mode sequence is initiated.