Why headphones do not connect to Xiaomi phone over Bluetooth – a full analysis of the problems

You try to connect wireless headphones to a Xiaomi smartphone (or Redmi/POCO), but the devices stubbornly do not see each other - or the connection is constantly reset? This problem is familiar to many owners of gadgets on MIUI, and the reasons for it can be a dozen: from a banal failure of a Bluetooth module to hidden bugs in the firmware. Unlike the iPhone, where the connection usually goes out of the box, Android smartphones (especially with custom shells like MIUI) often require manual adjustment.

In this article, we'll look at all the possible causes of malfunctions, from hardware to software, including the rare cases where the phone is not the fault, but the headphones themselves. MIUI They're responsible for Bluetooth stability, and what to do if standard methods don't work — FAQ Answering the most frequent questions from Xiaomi users.

1. Checking the basic settings: what could have gone wrong

Before digging deep, make sure the problem isn't in the obvious minutiae. Often users overlook simple things like flight mode or background restrictions for Bluetooth in MIUI.

Start with this checklist:

Pay special attention to the headphone pairing mode. Most models (for example, Xiaomi AirDots, Redmi Buds or Sony WH-1000XM4) need to hold the power button until the indicator flashes red and white (or blue depends on the model). If the indicator is on evenly, the headphones are already connected to another device.

Another common pitfall is the MIUI limitations on background processes, where in some firmware versions, the system automatically turns off the Bluetooth module if it's not actively used.

1. Go to Settings → Applications → Application Management → Three Points (menu) → Special Accesses.
2. Choose Battery Optimization.
3. Find Bluetooth (or Bluetooth Settings) in the list and install it without restrictions.

2. reset Bluetooth settings: when the phone "forgets" devices

If headphones used to connect, but now the phone “can’t see” them or the connection breaks after a few seconds, the problem can be hidden in the Bluetooth cache. In MIUI (as in pure Android), this cache is sometimes damaged – especially after system updates or a change in firmware.

To reset the settings:

1. Open Settings → Connections and Sharing → Bluetooth.
2. Slip on the three-point menu in the top right corner and select Clear Cache (or Reset Settings in older versions of MIUI).
3. Confirm the action and restart the phone.

💡

If there is no “Clear Cache” option, try to remove all the stored devices manually, then restart the phone and try to connect again.

After reset, try reconnecting the headphones. If the problem persists, move on to the next step.

Important: On some Xiaomi models (such as the Redmi Note 10 Pro or POCO X3 Pro), a Bluetooth reset can result in the loss of all stored devices, including smartwatches or fitness bracelets.

3.Firmware problems: MIUI bugs and how to get around them

One of the most frustrating causes of the malfunction is the MIUI firmware bugs, especially for Xiaomi, which often releases updates with flaws, for example, MIUI 12.5 and MIUI 13 have been massive complaints about Bluetooth connection problems after the update.

How to check if the firmware is to blame:

• 📱 Look at the version. MIUI: Settings → The phone. → Version. MIUI. If it's 12.5.XX or 13.0.XX — high probability of bug.
• 🔍 Check the forums: on the official forum Xiaomi or 4PDA Search for topics that mention your phone model and the words “Bluetooth».
• 🔄 Recoil on the old version: if the bug is confirmed, try rolling back to the previous firmware (instruction below).

If you are sure that the problem is in the firmware, there are two ways:

1. Wait for the official patch (may take weeks).
2. Install custom firmware (like LineageOS or Pixel Experience), but this requires unlocking the bootloader and risks voiding the warranty.

If you are not ready for firmware experiments, try a temporary solution:

⚠️ Note: In some versions MIUI Disabling the dual applications (if enabled) helps. Go to Settings → Annexes → Dual applications and disable it for all programs. This is due to a bug that causes the system to conflict with the Bluetooth stack.

4.Conflict with other devices: why the phone "doesn't want" to see headphones

The Bluetooth module in a smartphone can work unstable if several devices are connected simultaneously - for example, a smartwatch, a fitness bracelet or a car radio. MIUI There is a hidden limit on the number of active ACL-Asynchronous connection-less, and when the limit is exceeded, new devices simply do not connect.

To check it out:

1. Open Settings → Connections and Sharing → Bluetooth.
2. Turn off all devices except the headphones.
3. Try reconnecting.

If the headphones are connected, the problem is the conflict of devices.

• 🎧 Priority Headphones: In Bluetooth settings, tap on the headphones and select Priority Connection (if there is such a point).
• 🚗 Disable your car profile: If your phone has previously connected to your car, remove it from the list of connected devices.
• ⚙️ Limit background activity for other Bluetooth devices in Settings → Annexes → Application management.

It’s also worth checking if the headphones are connected to another device (like a laptop or tablet), and some models (like the AirPods or Samsung Galaxy Buds) automatically switch to the last active device.

5 Hardware problems: when it is not the fault of software

If neither software method worked, maybe the problem is with the hardware, either the phone or the headphones, and here are the most common "hard" reasons:

To check if the phone is to blame, try connecting the headphones to another device (like a laptop or tablet) if they work, the smartphone is a problem. If they don't, the headphones themselves are faulty.

To diagnose the Bluetooth module of the phone, you can use the engineering menu:

1. Open the Phone app and type ##4636##.
2. Go to Phone Information and scroll to the Bluetooth unit.
3. Look at the status: if you write Error or Disabled, the module is faulty.

💡

If the Bluetooth engineering menu is displayed as “On”, but the devices are not located – the problem is software (firmware or settings).

If you suspect a headphone malfunction, try resetting it to factory settings. For most Xiaomi models, it's done like this:

1. Put both earphones in the case.
2. Hold the button on the case for 10-15 seconds until the indicator flashes red and white.
3. Get the headphones out – they should automatically go into pairing mode.

6 Rare causes: from codec conflict to energy saving

Sometimes the problem lies in the inconspicuous details that users don't even know about, and here are a few rare but possible reasons:

• 🎵 Audible Codec Conflict: Some Headphones (e.g. Sony) LDAC Qualcomm aptX requires support for specific codecs. MIUI By default, it can be turned on SBC (Low quality), which causes connection breakdowns. To change the codec: Connect your headphones. In the notification panel, tap the Bluetooth icon. Select the audio settings. → Sound quality and try it out AAC or.

Aggressive energy conservation

Deep energy conservation

Settings → Battery and performance → Energy saving mode

Antivirus blocking

Avast

360 Security

Wi-Fi interference

5 GHz

2.4 GHz

Another rare but possible reason is regional restrictions: Some Xiaomi models (especially those designed for the Chinese market) have restrictions on connecting Bluetooth devices with specific profiles, and if you bought a phone from under the counter or brought it from abroad, check the region:

1. Open Settings → About the phone → All the characteristics.
2. Find the line Region or Market. If it says China, that could be the reason.

If none of these things worked, the last option is to reset the phone to factory settings, which is a radical method, but it often solves Bluetooth problems caused by deep system failures.

⚠️ Note: Before reset, be sure to back up the data through Settings → Additionally. → Backup and reset: Once reset, the phone will be “like new” and all settings (including saved Bluetooth devices) will be erased.

FAQ: Answers to Frequent Questions