Connecting wireless headphones to Xiaomi Redmi 9 Pro via Bluetooth: instruction + error solving

Wireless headphones have become an integral part of everyday life – they are convenient for listening to music, calling and even watching videos. However, users of the Xiaomi Redmi 9 Pro sometimes face difficulties when connecting for the first time: the device does not find the headphones, the sound is interrupted or there is a delay. In this article, we will analyze the step-by-step synchronization instructions for the features of MIUI 12/13/14, and also solve typical problems from resetting the headphone settings to eliminating interference.

It is important to understand that the connection process may vary depending on the headphone model (e.g. Xiaomi AirDots, Sony). WH-1000XM4 or JBL Tune 510BT) We'll focus on Redmi. 9 Pro, but most of the tips apply to other devices as well. Xiaomi/Redmi/POCO Android-based 10–13.

If you have already tried to connect, but encountered an error (“Device failed to connect”, “Device not found”), do not rush to blame the smartphone or headphones. In 80% of cases, the problem is solved by resetting Bluetooth settings or updating the software.

1. Preparation of headphones and smartphone for connection

Before syncing, make sure both devices are ready to connect. For the Redmi 9 Pro, it is critical to check:

• 🔋 Headphone charge: Most models require a minimum of 20 to 30 percent charge for stable connectivity. If the light flashes red, charge them for 10 to 15 minutes.
• 📱 Version. MIUI: Go to Settings. → The phone. → Version. MIUI. Redmi 9 Pro is currently running 12.5-14 (Android 10-13.
• 🔄 Pair mode: most headphones have an on/patch button (often 3-5 seconds).For example, Xiaomi AirDots Pro 2 needs to press and hold the touchpad on both headphones.

Pay special attention to the distance between devices. The optimal distance for the first connection is 10-50 cm If the headphones are located at the other end of the room, the smartphone may not detect them, and also disable other Bluetooth devices (fitness bracelets, speakers, smart watches) to avoid conflicts.

⚠️ Note: If the headphones were previously connected to another phone (e.g. iPhone), they should be reset to factory settings. The instructions for this are usually indicated in the user manual (e.g. Sony, hold the power button for 10 seconds).

2. Step-by-step instruction for connecting via Bluetooth

Now, let's get to the process. Follow the instructions in strict order.

1. Activate Bluetooth on your smartphone: Open Settings → Connections & Sharing → Bluetooth (or swipe down the notification bar and press the Bluetooth icon).
2. Put the headphones in pairing mode: For most models: 🎧 Xiaomi AirDots: Get your headphones out of the case, hold the touchpad on both 5 seconds (the indicator will start flashing white/red-blue). 🎧 Sony/JBL: Hold the power button 3–7 seconds before the beep or indicator flash.

Find the headphones in the list of devices

Bluetooth Menu on Redmi 9 The name of your headphones will appear (for example, “Mi True Wireless”). EB2» or «LE_WH-1000XM4»). Press them.

Confirm the conjugation

If a request for confirmation is made (sometimes with a PIN-by code), click on “Connect” or “Password: 0000” (default for most devices).

Once successfully connected, the headphones will be labeled "Connected" next to the headphone name, and you can now test the sound by playing music or video.

Headphones charged (>20%)|

Bluetooth on your smartphone enabled |

Headphones in pairing mode (flashing indicator)|

There are no other active Bluetooth devices nearby.|

Distance between devices < 50 cm-->

3. Problem Solving: Headphones don't connect

If your smartphone doesn’t see headphones or makes an error, try the following steps:

If none of these methods worked, reset your Bluetooth settings on your smartphone:

1. Go to Settings → System and device → Resetting → Network settings Reset.
2. Select “Bluetooth Reset” (does not affect other data).
3. Reboot the phone and reconnect.

⚠️ Note: Some Redmi 9 Pro firmware (especially custom ones) may not have a Bluetooth reset option, in which case a complete network reset (Wi-Fi, mobile data and Bluetooth) will help, but this will delete all saved passwords.

4. Sound optimization: codec, equalizer and delays

Even after a successful connection, the sound quality can be disappointing. Redmi 9 Pro has hidden settings to improve playback:

• 🎛️ Codec Choice: Default is used SBC (low quality. To include AAC Or aptX: Put your headphones on. Open the settings. → Connections → Bluetooth. Press the gear next to the headphone name. Select "Sound Codex» → AAC (for quality balance) or aptX (for Hi-Res audio, if supported).

equalizer

Settings → Sound → Equalizer

Bassboost

Clarity

Sound delay (lag)

Low delay

SoundAssistant

Google Play

The Redmi 9 Pro with MIUI 13+ has dual audio (simultaneously connecting to two devices), but it doesn’t work with all headphone models. To enable: Settings → Connections → Bluetooth → Additional → Dual audio.

💡

If after updating MIUI lost the sound in the headphones, try to turn off the function “Absolute Volume” in the Developer Settings (how to turn on: Settings → About Phone → MIUI version → 7 times click on the version).

5. How to turn off and reconnect the headphones

If you need to temporarily turn off your headphones (for example, to answer a call through a speaker), do the following:

• 🔌 Quick shutdown: swipe down the notification panel → tap on the headphone icon → «Shut down».
• 🔄 Automatic Connection: If the headphones have been paired before, they will connect automatically when turned on (if Bluetooth on the smartphone is active).
• 🚫 Device Removal: If Headphones are buggy, remove them from the list (Settings) → Bluetooth → gear → «Forget the device and connect again.