Modern smartphones like the Xiaomi Redmi 9 have almost completely switched to wireless audio technology, leaving the 3.5mm connector in the past or leaving it as an option for wired models. Owners often wonder how to sync their Bluetooth headphones to a device correctly and quickly to enjoy music or conversations without extra wires. MIUI, Which is important to consider for a stable job.
Before you start setting up, you need to make sure your peripheral device is ready to pair. Redmi 9 supports a wide range of profiles, from basic music listening to high-resolution codecs. However, the wrong sequence of actions can lead to the fact that the phone simply “does not see” the headset, and you have to spend time trying to connect again.
In this guide, we will take a detailed look at every step, from putting accessories into detection mode to fine-tuning the equalizer, how to avoid typical errors and what to do if the standard procedure does not give the desired result.
Preparation of headphones for pairing
The first and most critical step is to put the headset in visibility mode, and many users make the mistake of just turning on the device and wonder why the Xiaomi Redmi 9 doesn't show it on the list of available ones (TWS-Cases, overhead headphones) when switched on try to connect with the last known device, and do not become visible to new ones.
To activate the search mode, you usually need to pinch the function button on the case or touch zones on the ears themselves. The retention duration varies from 3 to 7 seconds until the indicator starts flashing alternating colors (for example, blue and red) or flashing quickly in one color. It is at the moment of rapid flashing of the indicator that the device is open to external connections. If you miss this moment, the phone may not detect the gadget.
⚠️ Warning: Make sure the headphones aren't currently connected to another smartphone or tablet nearby. Priority is often given to the last active connection and the device can ignore requests from Redmi 9.
There are several types of indicators that signal readiness:
- 🔵 Blue Blinking: Standard Search Mode for Most Models.
- 🔴🔵 Alternate flashing: Characteristic of budget models and some TWS.
- 🟢 Green glow: Less common, usually signifying a willingness to pair in specific patterns.
It's also important to check the headset's battery power. If the battery is discharged to zero, the device may turn on but not have the power to maintain the powerful Bluetooth signal needed to first get to know the phone. 20-30% before the beginning of the procedure.
Search and activate Bluetooth on Redmi 9
After the accessories are ready, we move on to the settings of the smartphone itself. In the MIUI shell installed on the Redmi 9, the control of wireless modules is taken out in a separate menu, but also available through the Quick Access Panel. First, open the Settings app and find the Bluetooth section. An alternative and faster way is to swipe from top to bottom of the screen to open the curtain and click on the Bluetooth icon.
In the menu that opens, you need to activate the switch slider. The system will immediately start scanning the surrounding space. It is important to understand that scanning is an active process that can last for several seconds. If the list of devices is empty, try pulling the list down for a forced update.
At the top of the screen, you'll see your phone's name and visibility status. By default, Redmi 9 is visible for all devices, but if you're in a crowded place, you can temporarily hide your phone to avoid unnecessary pairing requests. However, this is not critical for initial setup.
If you don’t see the Bluetooth icon in the notification curtain, you can add it:
- 🔽 Open the swipe control panel down.
- ⚙️ Click on the settings icon (cogs) or the edit button.
- ➕ Find the Bluetooth icon in the list of available widgets and drag it to the active area.
It’s worth noting that some versions of MIUI can duplicate Bluetooth settings in Connections and Sharing, which is for easy navigation, but the functionality is identical, and the main thing is to make sure that the module is on and running correctly, as evidenced by the active (blue or green) color of the icon.
The process of pairing devices
When both devices are ready, the main stage begins. In the Available Devices list, the name of your headset should appear on the Xiaomi Redmi 9 screen. It can be the same as the brand (e.g. Sony, JBL) or be a model number. Click on the name to initiate the procedure.
The system will request a confirmation of pairing. In most cases, the confirmation code is not required and the connection is automatic. However, some devices may require a pin code input. The standard combinations are 0000 or 1234. This information is always in the accessory manual.
☑️ Checklist of successful pairing
After the successful connection, the status will change to Connected, and next to the name will appear the battery icon (if the headset supports charge transfer) and a media icon. The sound in the phone will automatically switch from the speaker to an external source. You will hear a characteristic beep in the headphones confirming success.
⚠️ Warning: Do not move the devices too far apart at the time of the first connection. 10-15 Centimeters until full synchronization of profiles.
Sometimes the system may suggest that you allow access to contacts and call logs, and if you plan to use a headset for conversations, you must agree to it. For music, this access is not necessary, but it is safe to allow it, since the data is stored locally on the device.
Customization of sound and profiles
Once the connection is established, Redmi 9 allows you to flexibly manage your work profiles. Go to the Bluetooth menu, click on the gear or arrow next to the name of the connected device, and here you open the detailed configurator.
You will see switches for different types of traffic:
- 🎵 Multimedia sound: Responsible for transmitting audio from YouTube, players and games.
- 📞 Call sound: Passes the voice of the interlocutor through the headset.
- 🔔 System sounds: Allows you to hear notifications and keyboard clicks through headphones.
This menu often displays the battery level of the headphones, which is very convenient for monitoring, and you can also rename the device if you have multiple pairs of the same headphones to avoid confusion. Just click on the pencil icon or the name.
Secret codec customization
For high-quality audio enthusiasts, MIUI has a built-in equalizer. Go to Music → Settings → Sound Effects. You can choose presets (Rock, Pop, Jazz) or adjust frequencies manually, which will greatly improve sound, especially on budget headphone models.
Working with multiple devices
Xiaomi Redmi 9 supports connecting multiple Bluetooth devices simultaneously, but with limitations. Usually, a smartphone can only broadcast sound to one pair of headphones. However, it can be paired with a smartwatch, a fitness bracelet and a headset at the same time.
If you want to switch the audio from the speakers to the headphones or vice versa, you don't have to turn off Bluetooth. It's enough to select the desired output from the notification curtain or the play menu (Lock Screen), the system will offer the available options.
To turn off a particular device, you don't need to delete it from memory. Just click on the Bluetooth icon in the curtain or select "Disable" from the device menu, it will remain in the "My Devices" list and automatically connect the next time you turn on.
| Action. | The result | Retention in memory |
|---|---|---|
| Turn it off on the menu | Sound goes through the speaker | Yes, the device remains on the list. |
| Forget the device | Complete disconnection. | No, we need to reconjugate. |
| Turn off Bluetooth | Breaking all connections | Yes, the list is retained. |
| Resetting network settings | Removal of all pairs | No, a full cleanup. |
💡
Forget device completely removes encryption keys, and if you sell headphones or a phone, that’s a security imperative.
Solution and resetting of settings
Despite the stability of MIUI, there are times when Redmi 9 can't see the headphones or the connection is constantly breaking. First of all, try rebooting both devices, which solves 90% of the software glitches associated with overflowing the Bluetooth stack buffer.
If the problem persists, follow the following steps:
- 🗑️ Remove the device from the list ("Forget the device") and create a pair again.
- 📡 Reset network settings on your phone (Settings) → Connections and sharing → Reset Wi-Fi, mobile networks and Bluetooth).
- 🔋 Check if the energy-saving mode is on, which may limit the operation of the modules.
⚠️ Warning: Resetting your network settings will delete all stored Wi-Fi passwords and Bluetooth pairs.Be prepared to re-enter your wireless passwords.
It's also worth checking if an equalizer app or a third-party sound manager conflicts with system settings. Sometimes third-party programs intercept audio stream control, causing crashes, and removing such applications helps diagnose the problem.
In rare cases, the problem lies in the hardware or firmware version. Check for system updates in the About Phone menu. Xiaomi engineers regularly release patches that improve the stability of wireless connections.