Why don’t Bluetooth headphones connect to the Redmi 9 Note Pro the first time?
Wireless headphones have become an integral part of everyday life: they are convenient for listening to music, podcasts, audiobooks, and even for calls. However, users of the Xiaomi Redmi 9 Note Pro sometimes experience problems when they first connect — devices do not find each other, the connection is interrupted or the sound is distorted.
In this article, we will analyze the step-by-step algorithm for connecting any wireless headphones (including AirDots, Sony). WH-1000XM4, JBL Free and others) for Redmi 9 Note Pro, consider the typical errors and give recommendations for optimizing the connection. MIUI, which affect the stability of Bluetooth, and we will understand how to reset the module settings if the headphones “forgot” the phone.
Preparation for connection: what to check before pairing
Before you start connecting, make sure both devices are ready to go.Neglecting these steps often leads to crashes, especially if the headphones have already been paired with another gadget.
- 🔋 Headphone Charging: Make sure the headphones have a charge level of at least 30%. Many models (e.g. Xiaomi AirDots Pro 2) automatically turn off when charged low, which prevents detection.
- 📱 Update MIUI: Check the firmware relevance on the Redmi 9 Note Pro. In older versions (below). MIUI 12.5) were bugs with Bluetooth 5.0. Update via Settings → The phone. → Updating the system.
- 🔄 Reset previous connections: If the headphones have already connected to another device, reset their settings (usually holding the power button 10-15 seconds until the indicator flashes).
- 🛡️ Shutdown VPN Energy saving: Battery type functions → Energy saving regime or VPN Can block scanning of Bluetooth devices.
It’s also worth considering that some headphone models (such as Apple AirPods) may require additional steps to connect to Android devices, in which case you will need to install the manufacturer’s app (for example, AirBattery to display charge levels).
Step-by-step: how to connect headphones to Redmi 9 Note Pro
The pairing process takes no more than 2-3 minutes, if you follow the algorithm, and below is a universal instruction that is suitable for most wireless headphone models.
- Activate pairing mode on headphones: Usually, you need to hold the power button (or touchpad) until the indicator flashes white and blue (for Xiaomi) or red and blue (for Xiaomi) JBL/Sony). See the specific combination in the instructions for your model.
- Turn on Bluetooth on your smartphone: Swipe your finger down the screen to open the notification bar, and click on the Bluetooth icon. Or go to Settings → Connections and Sharing → Bluetooth.
- Start searching for devices: The name of your headphones (e.g. Mi True Wireless Earphones 2) will appear on the list of available devices.
- Confirm the pairing: If necessary, enter PIN-code (usually 0000 or 1234) Some headphones (such as Samsung Galaxy Buds) may request additional software installation — agree.
☑️ Checklist before connection
Important: Redmi 9 Note Pro with MIUI 13+ firmware has a “Fast Connection” feature – if the headphones support Google Fast Pair, they will connect automatically when you open the case cover (like AirPods).
Table: Headphone compatibility with Redmi 9 Note Pro
Not all wireless headphones work equally well with the Xiaomi Redmi 9 Note Pro. Below is a comparison of popular models by key parameters:
| Model headphones | Bluetooth version | Support codec | Sound delay (MS) | Features of connection |
|---|---|---|---|---|
| Xiaomi AirDots Pro 2 | 5.0 | AAC, SBC | ~120 | Automatic connection when opening the case |
| Sony WH-1000XM4 | 5.0 | AAC, LDAC, SBC | ~80 | Requires installation of Sony Headphones Connect app |
| JBL Free X | 4.2 | SBC | ~150 | Can be turned off when the battery is low |
| Apple AirPods Pro | 5.0 | AAC | ~100 | You need to hold the button on the case to pair |
| Huawei FreeBuds 4i | 5.1 | AAC, SBC | ~90 | Supports dual connection to two devices |
If your model is not represented in the table, pay attention to the Bluetooth version: Redmi 9 Note Pro supports Bluetooth 5.0, but for stable work it is better to choose headphones with a version at least 4.2.
Common Problems and Their Solutions
Even after successful pairing, users experience typical problems, and here are the most common ones and how to fix them:
1.The phone doesn't see the headphones
- 🔄 Reboot the Bluetooth module: Turn off and re-enable Bluetooth on your smartphone. If it doesn't work, reboot your phone.
- 📱 Reset network settings: Go to Settings → System and device → Resetting settings → Resetting Wi-Fi, Mobile Network and Bluetooth.
- 🔋 Check the headphones: Make sure they are in pairing mode (the indicator should flash blue and red).
2.The sound is interrupted or distorted
- 🎵 Change the audio codec: In Bluetooth settings (click on the icon) ⚙️ Next to the headphone name, select SBC instead AAC — That'll reduce the delays.
- 📶 Remove interference: Get away from Wi-Fi routers, microwaves or other 2.4GHz devices.
- 🔄 Disable Dual App: The function of cloning applications in MIUI It can conflict with Bluetooth. Check the settings. → Annexes → Dual Apps.
3.The headphones plug in, but no sound.
- 🔊 Check the volume: It is possible that the sound is reduced to zero on headphones or phone.
- 🎧 Reset your headphones: For Xiaomi AirDots, hold both touchscreens for 20 seconds until double blink.
- 📱 Select headphones as the output device: While playing music, swipe down the notification panel and select the headphones in the list of audio output devices.
What if the headphones are connected to only one ear?
⚠️ Attention: If after connecting the headphones the phone begins to discharge quickly, turn off the Absolute Volume function in Settings → Connections → Bluetooth → This option forces the smartphone to constantly synchronize the volume with the headphones, which increases power consumption.
Hidden MIUI settings to improve Bluetooth
Xiaomi Redmi 9 Note Pro based on MIUI has several hidden options that can significantly improve the quality of the connection with wireless headphones. These settings are not visible in the standard interface, but they can be activated through the developer menu or special commands.
1. Enabling the LDAC codec (for supported headphones)
The LDAC codec provides a higher sound quality, but it can increase latency.
- Activate Developer Mode: Go to Settings → About Phone and click on MIUI Version 7 times.
- Back to Settings → Additionally. → For developers.
- Find the Bluetooth Codec option and select LDAC (if available).
2. disable A2DP Hardware Offload
This feature is designed to save battery power, but sometimes causes sound distortions to turn it off.
Settings → For developers → Disable “A2DP Hardware Offload”3. Change of Bluetooth Priority
If your headphones often turn off during calls, change the connection priority:
Settings → For developers → Enable “Bluetooth Priority for Calls”⚠️ Note: Not all headphones support codec LDAC. If the sound starts to “break” after it is turned on, go back to the codec. AAC or SBC. Also remember that the developer mode gives access to system settings – do not change other settings unless you are sure of their purpose.
💡
If you often listen to music via Bluetooth, turn off automatic Wi-Fi shutdown while you sleep. Go to Settings → Wi-Fi → Additional → Sleeping Wi-Fi Support → Always. This will reduce playback delays.
How to Reset Bluetooth Settings on Redmi 9 Note Pro
If the headphones are plugged in with errors or the phone doesn't see devices that used to work normally, a full reset of Bluetooth settings will help, which will remove all the stored devices and return the module parameters to the factory.
To reset the settings:
- Go to Settings → Connections and Sharing → Bluetooth.
- Click on the three dots in the top right corner and select Clear Bluetooth cache (if the option is available).
- If there is no item, complete reset: Settings → System and device → Settings Reset → Network Resetting This will also reset your Wi-Fi and mobile network settings.
After reset, restart your phone and repeat the procedure for connecting the headphones. If the problem persists, check the headphones on another device - perhaps the malfunction is in them.
💡
Resetting Bluetooth settings is a last resort, so before you do that, try rebooting your phone and headphones, and upgrading your MIUI firmware to the latest version.