How to check the version of Bluetooth on Xiaomi Redmi Note 9: all ways

Why it’s important to know the Bluetooth version of the Redmi Note 9

Xiaomi Redmi Note 9 (codenamed merlin) is equipped with a Bluetooth module, but its version directly affects the speed of data transfer, the stability of connection with headphones, fitness bracelets and other gadgets. For example, Bluetooth 5.0 supports bidirectional data transfer at speeds up to 2 Mbps and a range of up to 40 meters in ideal conditions, while outdated versions (4.2 and below) are limited to 1 Mbps and 10 meters.

If you notice that wireless headphones start to “slow down” when listening to music or smartwatches constantly break the connection, the problem may lie in the version of the protocol.+ for all functions, including LC3-codecs and LE Audio.

In this article, we’ll look at all the ways you can check the Bluetooth version on the Redmi Note 9, from standard settings to hidden engineering menus, and see if you can update the protocol software and what to do if your smartphone doesn’t see modern gadgets.

Method 1: Checking through standard MIUI settings

The easiest method is to use the built-in MIUI tools. It is suitable for most firmware versions (from MIUI 11 to MIUI 14) and does not require superuser rights (root).

Instructions:

1. Open the Settings app (cog icon).
2. Go to the About Phone section (usually at the bottom of the menu).
3. Tap on the item All characteristics or Software Information (the name depends on the version of MIUI).
4. Scroll down to the Network block, and there will be a Bluetooth version string.

⚠️ Note: On some firmware (for example, MIUI 12.5 Enhanced) The Bluetooth version may not be displayed correctly — instead of 5.0, you'll see 4.2. It's an interface bug, not a hardware problem.

Check the MIUI updates in Settings → Software Update

Restart your phone (hold the power button for 10 seconds)

Install the diagnostic application (see next section)

Reset your network settings in Settings → Wireless Networks → More

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Method 2: Using Third-Party Applications

If standard settings don’t show the Bluetooth version or you doubt its accuracy, use third-party utilities that read data directly from the Qualcomm Snapdragon 662 chipset installed in the Redmi Note 9 and provide advanced information.

Top.-3 check-in:

• 📱 AIDA64 — Shows Bluetooth version, supported profiles (A2DP, AVRCP, HFP) And even the temperature of the chipset. The free version is available on Google Play.
• 🔍 CPU-Z — The SoC tab contains data about the Bluetooth module.
• 🛠️ DevCheck is a minimalist interface with a focus on hardware specifications. Displays the Bluetooth version in the Hardware section.

An example of the report from AIDA64 for Redmi Note 9:

⚠️ Note: Apps can show the best supported version of Bluetooth (e.g. 5.1), but the actual operation of the module depends on the firmware. On the Redmi Note 9, the hardware version is 5.0, and you can not update it software.

AIDA64|CPU-Z|DevCheck|Other |Do not use-->

Method 3: Engineering menu (for power users)

If you're ready to go into technical details, check the Bluetooth version through the Engineering Mode, which provides the most accurate information, but requires caution - wrong actions can disrupt the module.

Step-by-step:

1. Open the phone app and enter the combination: ##4636##
2. In the menu that appears, select Phone Information.
3. Scroll down to the Bluetooth block – there will be a Bluetooth version string.

Alternative code for Xiaomi:

##232338##

He opens the menu. Wi-Fi/Bluetooth Test, where the Bluetooth section displays the protocol version and MAC-address.

Method 4: Checking through ADB (for developers)

Developers and advanced users can learn the Bluetooth version using Android Debug Bridge (ADB), a method that requires connecting the phone to a computer, but provides the most accurate data directly from the system.

Instructions:

1. Turn on Developer Mode on Redmi Note 9: Go to Settings → About Phone. Tap the Build Number 7 times until the notification appears You became a developer!

Settings → Additional → For Developers

USB debugging

cmd

adb shell getprop ro.boot.bluetooth.version

Or an alternative team:

adb shell dumpsys bluetooth_manager

Example of conclusion:

Bluetooth version: 5.0 (LE supported)

Here LE stands for Low Energy (energy saving mode), which is critical for working with fitness bracelets and smartwatches.

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If the adb command doesn’t work, install Google’s Platform Tools and add the adb.exe path to Windows environment variables.

Can I upgrade Bluetooth to Redmi Note 9?

Unfortunately, the hardware version of Bluetooth on the Redmi Note 9 is tightly tied to the Snapdragon 662 chipset and cannot be modified software.

• 🔄 Update MIUI Sometimes it improves connection stability, but it doesn't change the protocol version. MIUI 14 Some users reported reduced connection delays TWS-headphone.
• 🛠️ Custom firmware (such as LineageOS or Pixel Experience) can optimize the Bluetooth stack, but the version remains 5.0.
• ⚡ External Bluetooth adapters (via the USB-C) Bluetooth 5.2 or 5.3 is not convenient for everyday use.

If you are critically interested in a new version of Bluetooth (for example, for the LE Audio or LC3-codecs, consider buying a more modern smartphone, for example:

• Xiaomi Redmi Note 12 Pro+ (Bluetooth 5.3),
• POCO X5 Pro (Bluetooth 5.2 with aptX Adaptive support)

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Bluetooth 5.0 on the Redmi Note 9 is a hardware limitation. No updates or firmware will be able to upgrade the protocol version to 5.1/5.2/5.3.

Frequent Bluetooth issues on Redmi Note 9 and their solutions

Even if the Bluetooth version on your Redmi Note 9 meets the device’s requirements, there may be connectivity issues.

⚠️ Attention: If the phone starts to overheat after connecting wireless headphones or a fitness bracelet, this may indicate a hardware malfunction of the Bluetooth module. In this case, contact the service center - self-repair can damage the motherboard.

FAQ: Answers to Frequent Questions