Owners of Xiaomi Redmi 6 smartphones often face a nasty situation: the Bluetooth module turns on itself, draining the battery and creating security risks. The problem can manifest itself in various ways, from accidental activation during calls to constant activation 5-10 minutes after turning off. In this article, we will analyze all possible causes — from software failures to hardware malfunctions — and offer proven solutions, including hidden MIUI settings, which will help regain control of the device.
The Redmi 6 (codenamed cereus) was released with a MIUI 9/10 based on Android 8.1 Oreo, where Bluetooth problems were common due to power optimization. However, even after upgrades to MIUI 12, some users continue to complain about spontaneous switching on, and it’s important to understand that if the module is activated only when connected to certain devices (such as headphones or car radio), the reason lies in the pairing protocols, not in the smartphone itself.
Before you start your diagnosis, answer two key questions:
- Does Bluetooth turn on regularly at regular intervals or chaoticly?
- Did the problem occur after installing a specific application or updating the system?
These details will narrow the range of possible causes by 70%.
1. Automatic MIUI features that you have not disabled
Xiaomi smartphones are known for their abundance of smart features that run in the background, many of which are directly connected to Bluetooth and can activate the module without your knowledge.
- 🔄 Automatic connection to devices: MIUI It remembers the latest connected gadgets (earbuds, speakers, fitness bracelets) and can turn on Bluetooth when it is detected. For example, if you pass a previously conjugated Mi Portable Speaker speaker, the smartphone will try to connect.
- 🚗 In-car mode: The function activates Bluetooth when connected to a car radio recorder via Android Auto or when a hands-free Bluetooth system is detected. → Connections and sharing → Mode "In the car".
- 🎧 Fast pairing for headphones: B MIUI There's a separate switch for fast-tracking Xiaomi headphones (like Redmi AirDots) that can go off when you open your headphone case.
- 📱 The function "Smart assistant": In the Settings section → Special facilities → The smart assistant is an option to automatically turn on Bluetooth when you start certain applications (for example, Spotify or Yandex Music).
To disable these functions:
- Go to Settings → Connections and Sharing → Bluetooth.
- Slip on three dots in the upper right corner and select Bluetooth Settings.
- Turn off the Automatic Connection and Quick Connection options.
- Go back to the basic settings and check the Special Opportunities section for active automation.
⚠️ Note: If you use the Mi Band fitness bracelet, its application (Mi Fit or Zepp Life) can force Bluetooth to synchronize data.
2. firmware failures: MIUI and Android bugs
Redmi 6 originally ran on MIUI 9 with Android 8.1, where bugs with control of radio modules (Bluetooth, Wi-Fi, GPS) were known. Even after upgrading to MIUI 12, some users are faced with a problem due to:
- 🐛 Incorrect service operation bluetooth_midi: This system process is responsible for interacting with MIDI-If it freezes, it can force the module to activate.
- 🔄 Conflicts with energy-saving algorithms: MIUI aggressively optimizes background processes, which sometimes leads to malfunctions in the Bluetooth stack.
- 📱 File errors bt_config.conf: Bluetooth Configuration File Can Be Damaged When Your Device Is Incorrectly Shut Down.
How to diagnose the problem:
- Check the error log: adb logcat | grep -i Bluetooth If the lines with the logs are repeated E/bt-btm ( 1234): btm_process_inq_results: Inquiry cache flush, this indicates a failure in the scanning process of devices.
- Install the Bluetooth Auto Connect app from Google Play and check if there are automatic activation messages in the connection logs.
Decisions:
- 🔧 Reset Bluetooth settings: Go to Settings → System system → Additionally. → Settings reset. Select Network Settings Reset (this will also reset Wi-Fi and mobile data).
Retrace to stable firmware
Fastboot
3. Malware applications and advertising SDKs
One of the most common reasons for spontaneously turning on Bluetooth is an application with aggressive advertising SDKs (e.g. AppLovin, Unity Ads, IronSource).
- 📡 Collecting data about nearby devices (for targeted advertising).
- 🎯 Show local notifications when certain gadgets are detected (for example, in a shopping center).
- 🔗 Transfer of device identifiers to advertising networks.
List of apps often to blame for the problem:
| Annex | Risk | Action. |
|---|---|---|
| Clean Master, DU Speed Booster | High-pitched | Remove and replace it with Files by Google |
| SHAREit, Xender | Medium. | Turn off auto-start in battery settings |
| Advertising games (such as Homescapes) | Low. | Limit background activity |
| Applications for saving battery | High-pitched | Remove – they often conflict with MIUI |
⚠️ Note: Some applications (such as Mi Credit or Mi Pay) have system permissions and may include Bluetooth for location verification. ADB: adb shell pm disable-user --user 0 com.xiaomi.payment
Hardware malfunctions: from antenna to controller
If the software methods didn't work, the problem could be hardware. Redmi 6 is equipped with a Qualcomm Snapdragon 625 chip, where Bluetooth and Wi-Fi are controlled by the same WCN3610 module.
- 📡 Bluetooth antenna damage: Often occurs after falls or moisture.The antenna is located at the top of the board next to the headphone jack.
- 🔌 Short circuit in the module power supply: Leads to false controller positives.
- 🔥 Chip overheating WCN3610: Due to wear of thermopaste or dust in the case.
- 🔋 Failure of the power controller: Module PM8941 It can give false signals to turn on radio modules.