How to find out the Bluetooth version on Xiaomi Redmi Note 9: the full guide

Xiaomi smartphone owners often face the need to accurately define the characteristics of wireless interfaces, especially when connecting specialized gadgets or diagnosing problems with connection stability. The Redmi Note 9 model, released in 2020, is based on the MediaTek Helio G85 processor, which technically supports the Bluetooth 5.0 standard, but the MIUI software shells sometimes hide detailed information from the average user. Understanding the real version of the protocol is critical to ensure compatibility with new headphones, fitness trackers and car multimedia systems that require certain codecs or low data latency.

The secrecy of this information in the standard Android interface is due to the policy of manufacturers who consider such data as technical details that do not require the intervention of the owner. However, for enthusiasts and repair specialists, knowing the exact version number, as well as the supported profiles, becomes a key factor in troubleshooting. In this article, we will discuss all available methods of obtaining data from simple browsing of system logs to using professional command-line utilities.

It is worth noting that a software failure or a failed firmware update can lead to incorrect display of data, so it is important to double-check the information in several independent ways. The MediaTek MT6765/Helio G85 hardware platform in Redmi Note 9 is physically limited to Bluetooth 5.0 module, and it is impossible to upgrade it to version 5.1 or 5.2. Next we will consider the step-by-step algorithms for each verification method.

Official specification and hardware limitations of Redmi Note 9

Before we get to software testing, we need to be clear about what hardware we’re dealing with. The Redmi Note 9 (global version) features a MediaTek Helio G85 chipset that integrates a wireless module. According to the chipset’s official documentation, the controller supports Bluetooth 5.0 Low Power (BLE) standard, meaning that any applications or sites promising to “unlock” Bluetooth 5.2 or 5.3 on that device are either wrong or fraudulent.

It is important to distinguish between protocol versions and supported codecs. Even if you have the latest version of MIUI 12.5 or newer, based on Android 11, the physical module remains the same. Users often confuse support for aptX, LDAC or LHDC codecs with the version of Bluetooth itself. On Redmi Note 9, support for advanced codecs may be limited or absent depending on regional firmware (Global, EEA, China), which also affects sound quality, but does not change the basic version of the protocol.

There is a common misconception that an operating system update can magically update the Bluetooth version. It is not: wireless module drivers are “sewn” at the kernel level and depend on the chipset vendor. However, the MIUI update can fix bugs in the Bluetooth stack, improving connection stability and pairing speed, which is sometimes mistaken by users as an upgrade to the version.

Use of the Engineering Menu for Module Diagnostics

One of the most reliable ways to get information about the hardware of a smartphone is to log into the engineering menu. In MediaTek-based devices, such as the Redmi Note 9, this functionality is built deep into the system. It does not require a Root right to access it, which makes it safe for the average user.

Type a special code in the dial box: ##3646633##. If the code is entered correctly, the screen will instantly switch to the EngineerMode interface. The interface may look intimidating because of the abundance of technical terms, but we only need one tab. Go to the Connectivity tab, and then select Bluetooth. This shows the current status of the module, the device address and, most importantly, information about the protocol version and test status.

☑️ Checking through the Engineering Menu

Done: 0 / 5

Note that in some regional versions of Xiaomi firmware, access to the engineering menu can be blocked at the carrier level or modification of MIUI. In this case, the code simply does not work, and you will remain in the normal interface of the call. This does not mean that the phone is broken, but only a software limitation. Also be careful: changing the settings in other sections of the engineering menu (for example, Telephony or Hardware Testing) without proper knowledge can lead to unstable operation of the radio module or loss of the network signal.

⚠️ Warning: Never change the values in the Power or Frequency fields in the engineering menu unless you are performing a professional antenna calibration.

System Log Analysis via ADB (for Advanced Users)

The most accurate and detailed information about the Bluetooth version and supported features can be obtained through the Android Debug Bridge debugging bridge (ADB). This method requires connecting the smartphone to the computer through USB-cable and the presence of a set of platform tools on the PC. This method gives access to the kernel logs, which spell out the real characteristics of the chip.

First, you need to activate the developer mode on Redmi Note 9. → About the phone and quickly press 7 times on the item "Version" MIUI". Then go to Settings. → Advanced settings → For developers and activate the switch USB-Debugging. Connect your phone to your PC, accept the request for debugging permission on your smartphone screen, and open the command prompt on your computer.

adb logcat -s BluetoothManagerService | grep "LocalAdapterInfo"

Executing this command will display a stream of logs associated with Bluetooth management. In the output lines, look for phrases containing the version. HCI (Host Controller Interface, or chip revision number, can also be used to use the adb shell dumpsys command. bluetooth_manager, It will give you a more structured report on the status of the Bluetooth manager, including the list of connected devices and their protocol versions.

What if the ADB can’t see the phone?
Make sure that drivers are installed on the computer ADB. Try replacing it. USB-cable to the original, as some cables only support charging. Also check if the antivirus does not block the connection.> Use of the ADB It is safe if you are just reading logcats, dumpsys, and problems can only occur if you try to write system partitions or change flags without backup. For the Redmi Note 9, this method is especially relevant, as it allows you to see which driver is loaded at the moment, which is useful when customizing the system. If you don’t want to mess with the command line or the engineering menu, specialized applications from the Google Play Market will come to the rescue. There are many utilities that can read the system properties of Android and display them in a convenient way. The most popular and time-tested are Bluetooth Scanner, Bluetooth Info or comprehensive information collectors like AIDA64. Annex AIDA64 It provides comprehensive information not only about Bluetooth, but also about all components of the smartphone. After launch, go to the Network or Bluetooth section, which will indicate the protocol version, device address, scan status and a list of supported profiles. The advantage of these applications is that they automatically interpret technical codes, giving a clear result, for example: "Bluetooth 5.0" LE". 📱 AIDA64: Comprehensive analysis of all the iron, shows the exact version of Bluetooth and the chipset used. 🔍 Bluetooth Scanner: Specializes in scanning the environment, but in the settings of the device shows the version of your adapter. ⚙️ CPU-Z: Although the focus is on the processor, the Sensors or System tab often contains data about wireless modules. API If the manufacturer has blocked access to certain information at the system level, the application can show the data from the words of the system itself (which may be generic), rather than the actual specifications of the chip. AIDA64, The Bluetooth Characteristics Table in Redmi Note 9 For the systematization of information, we will give a summary table of the characteristics of the wireless module installed in the Xiaomi Redmi Note 9. Depending on the region (China, India, Europe), the names of some profiles may vary slightly, but the basic version of the protocol remains unchanged. Value / Characteristics Note Note Note Version Bluetooth 5.0 Low Energy (BLE) Support Frequency Range 2.4 GHz - 2.4835 GHz ISM range Maximum range Up to 10-15 meters In open spaces Support SBC codecs, AAC aptX depends on regional firmware Dual audio Supported Possssible connection of two headphones at the same time As can be seen from the table, Redmi Note 9 offers a modern set of features for its time. Support for dual audio allows you to broadcast on two travel conveniently. However, there is no guaranteed support for aptX. HD or LDAC at the software level can disappoint audiophiles, although for the usual listening to music in streaming services, codec quality SBC and AAC Even knowing the exact version of Bluetooth, users can face problems: the phone does not see the device, communication is constantly interrupted or sound is transmitted with a delay. Often, it's not the protocol version, but rather the software conflicts or the accumulated debris in the Bluetooth cache. The first step is to always reset your network settings completely. → Connection and sharing → Reset Wi-Fi, cellular and Bluetooth. Press Reset and confirm action. This will remove all the stored pairs and return the network settings to factory values, which often solves problems with the "glue" connection. ⚠️ Warning: Resetting network settings will remove all saved passwords from Wi-Fi networks. Make sure you remember passwords from important access points before performing this operation. If the problem persists, check if power saving mode is turned on, which can aggressively limit the operation of the Bluetooth module to save battery life. MIUI There is a Battery Optimization feature that can kill background Bluetooth services, add the application you are using (such as a player or navigator) to the exclusion list, or set battery mode to "No Limits" for mission-critical programs. Frequently asked questions (FAQ) Can you upgrade Bluetooth on Redmi Note 9 to version 5.2 through firmware? No, it's not possible. The Bluetooth version is determined by a hardware chip (in this case, MediaTek Helio). G85), It's a software update that can improve stability, but it won't change the physical version of the protocol. Why doesn't my Redmi Note 9 see new Bluetooth 5.3 headphones? Bluetooth is backwards compatible. The 5.0 device must see and connect to the 5.3 devices. If there is no connection, the problem is most likely in the headphone pairing mode (they should be in search mode) or in the crowded list of previously connected devices on the phone. MIUI What about Bluetooth data speed? Yeah, driver optimization in different versions. MIUI It can affect connection stability and delay (latency). Newer firmware versions usually contain bug fixes for the Bluetooth stack, but baseline data rates are limited by Bluetooth capabilities. 5.0. How to check which codecs my Redmi Note supports 9? It is best to use a root or root terminal application. ADB Adb shell dumpsys media_codecs. In normal mode, the user sees only standard SBC and AAC. The presence of aptX is often hidden and only activated when compatible devices are connected in certain regions.