The compass in Xiaomi’s Redmi Note 8 Pro is not just a nice bonus, it’s an important tool for navigation, maps (Google Maps, Yandex.Navigator) and even some augmented reality games. However, over time, the sensor can begin to “lie”: the compass needle floats, the phone misidentifies the directions of the world, and applications give out a “weak magnetometer signal” error, the causes varying from software failures to physical damage after a fall.
In this article, you will find a step-by-step guide to calibrating the compass on the Redmi Note 8 Pro, taking into account the features of the model, including checking the health of sensors, resetting settings and alternative methods for correcting errors, and we will also discuss why the compass may not work correctly after updating the MIUI or replacing the battery, and what to do about it.
Why the compass on the Redmi Note 8 Pro lies: the main reasons
Before you start calibrating, it is important to understand what caused the failure. In the Redmi Note 8 Pro, the compass is operated by a magnetometer (Hall sensor), which can malfunction for the following reasons:
- 🔄 Software failure: after the update MIUI or resetting the sensor may require recalibration.
- 📱 The influence of metal objects: magnet covers, keys in your pocket or even metal buttons on clothes distort readings.
- 🔋 Problems after battery replacement: Unoriginal batteries or careless repairs can damage the sensor plume.
- 🌍 Geomagnetic anomalies: in some regions (for example, the Kursk magnetic anomaly), the compass is unstable.
- 🛠️ Physical damage: A phone drop or moisture hit often disables the magnetometer.
If the compass needle twitches randomly or shows the wrong direction even after calibration, the problem may be a hardware malfunction, in which case only diagnostics at the service center will help, but in 80% of cases the issue is solved software - more on that.
How to check if the compass works on the Redmi Note 8 Pro
Before you calibrate the sensor, make sure it's functioning at all.
- Open the Compass app (if not, download from Google Play, such as Compass Galaxy).
- Put the phone on a flat surface and rotate it in a circle, and the arrow should follow the movement smoothly.
- If the arrow does not respond or jumps chaotically, the sensor is faulty or disabled.
For a deep diagnosis, use the engineering menu:
- In the phone app, dial the code ##4636##.
- Select the Testing item → Sensors.
- Find the Magnetic field string, or Magnetometer, and as you rotate your phone, the X, Y, Z axes should change.
| Sensor readings | What does it mean? | Action |
|---|---|---|
| Values change smoothly. | Sensor's working correctly. | We can start calibration. |
| Values are not changed or equal to zero | Sensor is down or broken. | Check the settings or contact the service |
| Values gallop randomly | Strong magnetic interference or sensor damage | Remove metal objects or calibrate elsewhere |
⚠️ Note: If the magnetic field sensor is not present in the engineering menu, this may mean that it is turned off at the firmware level (for example, after an unofficial application). ROM) It's physically damaged, and then calibration won't help.
Step-by-step: how to calibrate a compass on the Redmi Note 8 Pro
Calibration of the compass on the Redmi Note 8 Pro is performed through standard MIUI settings. Important: the procedure requires the absence of metal objects nearby and the stable position of the phone.
Remove the magnet case |
Step away from metal objects (keys, coins, laptops) |
Close all applications that use GPS|
Charge your phone at least 30%-->
- Open Settings → System applications → Compass.
- Slip on Calibration of the compass (or Reset of the compass, depending on the version of MIUI).
- Follow the instructions on the screen: You usually need to rotate the phone in the air, describing the infinity sign (∞), or turn it over on three axes.
- After completion, the message Calibration is successful.
If the standard method doesn’t work, try an alternative method using Google Maps:
- Open Google Maps and click on the blue dot of your location.
- In the window that appears, select Calibration of the compass.
- Follow the hints by rotating the phone in different planes.
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If the calibration fails the first time, try it outdoors (e.g., in the yard) and metal structures in the room (rebars in the walls, elevators) can interfere with the procedure.
What to do if calibration does not help: additional methods
If the compass is lying after calibration, the problem may be a bigger one.
- 🔄 Reset sensor settings: go to Settings → All parameters. → Resetting settings → Resetting sensor settings, which will bring back the factory settings of the magnetometer, gyroscope and accelerometer.
- 📱 Update MIUI: Check for updates in Settings → The phone. → System update: In newer versions, firmware often fixes sensor bugs.
- 🛠️ Cleaning the compass cache: go to Settings → Annexes → Application management → compass → Warehouse → Clear the cache.
- 🔧 Use of third-party utilities: applications like GPS Status & Toolbox or Sensor Box lets you manually test and calibrate sensors.
Critical information for the Redmi Note 8 Pro: If the compass stopped working after the battery was replaced, check if the sensor plume (it passes near the battery) has damaged. In 60% of cases, the malfunction is due to this.
⚠️ Note: Do not use applications for hard calibration of sensors (for example, Sensor Calibration) unless you are sure of their safety. They can write incorrect data into system files, which will lead to complete inoperability of the magnetometer.
How to avoid compass problems in the future
To make the compass on the Redmi Note 8 Pro work stably, follow these guidelines:
- 📵 Avoid metal covers, especially those with magnetic fasteners, which create a permanent magnetic field that knocks the sensor down.
- 🔋 Don't discharge the phone to zero. Deep discharge resets the sensors' temporary data, which may require recalibration.
- 🌡️ Do not overheat the device. High temperature affects the accuracy of the magnetometer. Avoid direct sunlight and games with maximum load on the processor.
- 🛠️ Update your firmware regularly. MIUI Frequently fix sensor-related bugs.
If you use navigation often, repeat the calibration every 2-3 months, even if there are no visible problems, which will help to avoid gradual "leaving" of the readings.
What if the compass only gets knocked down in certain places?
Frequent calibration errors and how to avoid them
Many users make common mistakes that nullify all efforts to adjust the compass.
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Calibration next to metal | The sensor remembers distorted data | Remove all metal objects at a distance of 1-2 meters |
| Interruption of procedure | Compasses may start to work worse than before calibration | Wait for the message of successful completion |
| Use of informal firmware | Sensor drivers may be missing or not working properly | Install an official MIUI for your model |
| Calibration in motion (in the car, bus) | Sensor detects false data due to vibrations | Perform the procedure on a flat, stationary surface |
Another common problem is the use of magnet cases for attachment (e.g. car holders), even if you remove the case before calibration, the residual magnetization of the case can persist for several hours, in which case demagnetization will help, just leave the phone overnight away from the sources of the magnetic field.
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If the compass is still lying after all the manipulations, the problem is probably hardware. In the Redmi Note 8 Pro, the magnetometer is soldered into the motherboard, and its replacement requires soldering at the service center.