Why does the smartphone constantly display a dynamic warning?
Xiaomi Redmi 9A owners often face a pesky “Don’t close the speaker area” notification that appears when talking, listening to music or even in standby mode, a message that blocks part of the screen and prevents you from using your phone.
The Redmi 9A uses a proximity sensor that detects when you hold your phone to your ear, and if it detects an obstacle near the speaker (like a finger, a cover, or a hair), it issues a warning to prevent the speaker from overheating or distorting the sound, but sometimes it is falsely triggered by sensor failure, contamination, or software errors.
In this article, we will discuss 5 proven ways to disable or adjust the warning, and also explain in which cases it is better not to ignore it.
Method 1: Calibration of the proximity sensor
In 70% of cases, the problem is solved by simple sensor calibration. Xiaomi Redmi 9A allows you to do this through a hidden engineering menu, but it is important to follow the instructions precisely so as not to disrupt the operation of other sensors.
How to calibrate:
- 📱 Open the phone app and enter the combination: ##6484##
- 🔧 In the menu that appears, select Proximity Sensor).
- 📊 Press Calibrate and wait for the process to be completed (the phone will beep).
- 🔄 Reset the device.
If the warning continues to appear after calibration, check the cleanness of the sensor area (usually located to the right of the front camera).
Battery charge > 30%|Remove the cover and film|Wipe the sensor area with an alcohol napkin|Close background annexes-->
Method 2: Disconnect through the developer settings
A more radical method is to completely shut down the proximity sensor through developer mode, which will remove the warning, but can lead to automatic screen activation during calls (the risk of accidental taps).
Step-by-step:
- Activate Developer Mode: Go to Settings → About Phone. 7 times click on the MIUI Version until the notification appears.
Settings → Additional → For Developers
Disable the proximity sensor
Disable proximity sensor
Reboot the phone.
What if the item "Disable proximity sensor" is not?
⚠️ Warning: Once the sensor is turned off, the screen will not go out during calls, which can lead to accidental button presses or a quick battery discharge.
Method 3: Resetting the sound settings
Sometimes the warning comes from a failure in the audio profile settings, and factory resets help in 30 percent of cases without affecting personal data.
How to perform the reset:
- 🔊 Go to Settings. → Sound and vibration.
- 🔄 Click on the three dots in the upper right corner and select Reset Settings.
- 📱 Confirm the action and restart the phone.
If the problem persists after the reset, check the speaker in safe mode (press the power button → Safe Mode). If the warning does not appear in it, one of the installed applications is to blame.
💡
Before reset, write down the current volume settings for each profile (call, media, alarm) to quickly restore them later.
Method 4: Update or roll back firmware
Some versions of MIUI for Redmi 9A (especially 12.0.x and 12.5.x) have a bug with false sensor positives. Updating to the latest stable version or rolling back on the previous one can solve the problem.
Table of current firmware versions for Redmi 9A (data for 2026):
| MIUI version | Android | Bug status | Recommendation |
|---|---|---|---|
| 12.0.8 | 10 | There are false positives. | Update |
| 12.0.15 | 10 | Corrected in 80% of cases | The best option |
| 12.5.1 | 11 | Bug's coming back. | Retrace on 12.0.15 |
How to update firmware:
- Go to Settings → About the phone → System update.
- Click Check Updates and wait for the download.
- Install the update and restart the phone.
⚠️ Warning: If new bugs (such as fast battery discharge) appear after the update, go back to the previous version via Fastboot or Recovery. 9A There is on the official forum Xiaomi.
Method 5: Physical inspection and repair
If the software methods did not help, the reason may lie in a hardware malfunction:
- 🔧 Oxidation of proximity sensor contacts (often after moisture is ingested).
- 💥 Mechanical damage to the plume connecting the sensor to the motherboard.
- 🔊 Factory marriage dynamics or sensor (found in batches 2020-2021.).
How to diagnose a hardware problem:
- 🔍 Illuminate the flashlight on the sensor area – if corrosion is visible under the film, cleaning is required.
- 📱 Check the sensor response in the test menu (#4636## → Testing of equipment).
- 🔧 If the sensor doesn't respond at all, contact the service center. 9A — from 800 to 1500 rubles (2026).
💡
If the phone is warranty, don’t disassemble it yourself! Xiaomi may refuse free repairs on autopsy trails.
What happens if you ignore the warning?
Many users simply close the notification and continue to use the phone, but the constant disregard can lead to:
- 🔥 Overheating speaker – especially when talking for long periods or playing music at maximum volume.
- 🎵 Distortion of sound - wheezing, crackling or completely switching off the speaker.
- 📉 Reduced battery life – the system will spend additional resources on processing false sensor signals.
If you decide to leave everything as it is, at least follow these rules:
- 📵 Do not close the speaker with your finger during calls.
- 🔊 Do not use the maximum volume for more than 10 minutes in a row.
- 🔄 Regularly (once a month) calibrate the sensor.