Wireless connectivity issues on Xiaomi smartphones often stem from a crowded list of previously paired gadgets. MIUI and HyperOS store data about each connected device, which over time can lead to address conflicts or search errors. If your phone stops seeing headphones or constantly loses touch with the watch, a standard module shutdown will not help.
You'll need to do a deeper cleanup, which includes deleting profiles from system memory and resetting app service data, which won't affect your personal files, photos or contacts, but will return factory operating parameters to the wireless module. Understanding how to manage these settings properly will save you time and nerves when troubleshooting.
Many users mistakenly believe that it is enough to simply turn off Bluetooth in the notification curtain to reset all settings.In fact, com.android.bluetooth stores encryption keys and keys. MAC-This digital trash is often the reason a new gadget refuses to mate or is unstable. In this article, we'll look at all the cleaning methods, from manual removal to full resetting of service parameters.
Manual Deletion of Devices via Standard Menu
The easiest and safest way to make room for pairings is to use a regular interface, which is suitable for cases where the phone is working normally, but you want to remove old or unnecessary devices so you don't get confused. You need to go to Settings, then select Bluetooth, and here you will see a list of all saved profiles.
Click on the arrow next to the device name or hold your finger on its name to call the context menu. In the window that opens, select the option "Disable" or "Delete." The system will request confirmation of the action, after which the entry about the gadget will be erased from the database. If you have many old profiles, this operation will have to be repeated for each of them.
- 📱 Open the settings and go to the Bluetooth section.
- 🗑️ Click on the gear icon or arrow next to the device.
- ✅ Confirm the deletion by selecting the appropriate command in the menu.
- 🔄 Repeat the procedure for all unnecessary entries in the list.
It's worth noting that once the device is removed from the list, the phone record can also be saved on the gadget itself (e.g. headphones), so it's better to pair it again or reset the settings on the peripheral itself to clean it up completely, and this is especially true if you're planning to sell the phone or transfer it to another user.
Resetting Bluetooth application data via settings
If manual deletion doesn’t work or the list of devices is not behaving correctly (for example, devices disappear and reappear), you need to clear the cache and system service data. This action will return the Bluetooth module to the state of “as after purchase.” It is important to understand that after this procedure you will have to re-connect all the necessary gadgets: watches, bracelets, headphones and automotive systems.
To do this, go to Settings → Applications → All Apps. In the upper right corner, click on three dots and select Show System Processes. Search for “Bluetooth” or search for “Bluetooth.” click on “Clean” and select “Clean All” (or “Clean Data”).
⚠️ Note: After clearing Bluetooth data, all previously stored access keys will be deleted.Make sure you know passwords or pairing codes for your devices if they are required to reconnect.
In some versions of MIUI, the path may be slightly different: Settings → Connections and Sharing → Bluetooth → Menu (three dots) → Reset your Wi-Fi, mobile internet and Bluetooth settings. This option is more radical, as it also resets the settings of Wi-Fi networks and mobile data, removing saved passwords from routers.
☑️ Checklist before Bluetooth data reset
Using an Engineering Menu for Deep Cleaning
For advanced users who are faced with complex errors in the Bluetooth stack, there is an access to an engineering menu that allows you to control the radio module at a deeper level than standard settings, but use it with extreme caution, since changing the wrong parameters can lead to unstable communication.
To get into the testing menu, open the Phone app and dial the combination ##6484## or #4636##. From the menu that opens, select Bluetooth or Bluetooth Test, where you can see the status of the module, the firmware version of the chip, and perform on/off test cycles.
#6484## - Entrance to the CIT Engineering Menu
#4636### - Testing menuThis section often includes the option "Bluetooth Address" or "Clean BT List" that forcibly clears the table of associated devices at the firmware level. If standard methods did not work, this method can be a salvation. However, do not try to change the RSSI values or signal power without understanding the consequences, this can disrupt the antenna.
What to do if the engineering menu is not opened?
Table errors and methods of their elimination
Different symptoms of Bluetooth problems require different approaches to solving. Below is a table that will help you quickly identify the problem and choose the right method of cleaning or setting up. Don’t ignore simple tips, as often the problem lies not in a software failure, but in the trivial conflict of protocol versions.
| Symptom of the problem | Probable cause | Recommended action | Difficulty |
|---|---|---|---|
| The phone doesn't see the device. | Cash overflow or service failure | Clearing the Bluetooth application data | Low. |
| Distance communication break | Interference or weak signal | Reset network settings and Bluetooth | Medium |
| Device "Conjugated, no access" | Conflict of encryption keys | Remove the device and create a pair again | Low. |
| Persistent audio breaks | Outdated codec or driver | Change the codec in the developer menu | Tall. |
Using a spreadsheet allows you to structure the diagnostic process. If you are faced with a situation where the phone sees the device but does not connect, the most likely problem is in the saved profile. In this case, manual deletion and repairing helps. If the problem is systemic (for example, after an Android update), you may need to completely reset your network settings.
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Helpful tip: If Bluetooth is unstable after a system update, try turning off the Adaptive Audio feature in Bluetooth settings.This often eliminates lags when switching between applications.
Cleaning through the developer menu and debugging
Xiaomi owners have a powerful tool in their arsenal, the developer menu, which is hidden by default, but activating it gives you access to the finer settings of the Bluetooth stack, where you can not only clean your devices, but also change the versions of your profiles, which can be critical for compatibility with old or very new devices.
To activate the menu, go to Settings → About Phone and quickly click on MIUI Version (or OS Version) 7 times. Once the “You’ve become a developer” notification appears, go back to the main settings menu, select “Additional” → “Developers” and scroll down to the “Network” or “Bluetooth” section.
Here you are interested in the following options:
- 🛠️ Bluetooth MAP Version: You can try changing the protocol version.
- 📡 Bluetooth Avrcp Version: Affects Media Player Management.
- 🔄 Disable absolute volume: Reset volume control.
Although there is no direct “Clear Everything” button, resetting the settings in this menu (often requiring a reboot) can eliminate software conflicts, and you can find the “Enable HCI Bluetooth Log” option on the developer menu, which allows you to log all events, which is useful for deep diagnostics if you plan to contact the service center.
⚠️ Note: Changes to Avrcp profile versions or MAP In the developer menu, some devices may no longer be controlled from the phone (e.g., no tracks on the headphone buttons will be switched!
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The developer menu is a powerful diagnostic tool, but changing the Bluetooth stack settings requires caution and understanding the implications for device compatibility.
Radical measures: Resetting network settings
When none of these methods work, the last software option is to reset your network completely, and this will affect not only Bluetooth, but also Wi-Fi and mobile Internet, all saved passwords from wireless networks will be deleted, and the APN settings for the mobile operator will return to factory.
Resets can be done via the path: Settings → Connections and Sharing → Reset Wi-Fi, mobile internet and Bluetooth. The system will warn you of the consequences. Click Reset at the bottom of the screen and enter the unlock password. The phone will reset the network modules and the Bluetooth list will be completely cleared.
This method is effective in 95% of software failures, it removes any broken configuration files that may have been left behind after a failed update or file system crash. After the procedure, the phone will behave like a new connection, so (be prepared) to re-enter your home Wi-Fi passwords.
Even if resetting the network settings didn’t solve the problem and the phone still doesn’t see the device or is running with errors, there is a high probability of a hardware malfunction of the Bluetooth module.