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

Owners of Xiaomi Redmi 9 smartphones often face the need to clarify the specifications of their device, especially when it comes to wireless connections.Knowing the exact specification of the communication module is important to understand which audio codecs the gadget supports, how stable the connection with the smartwatch or fitness bracelet will be, and why there may be problems with transferring files. In most cases, the system does not show this data in a prominent place in the standard menu, which causes users legitimate questions.

The Redmi 9, released in 2020, is based on a MediaTek Helio G80 processor that integrates a radio module of a certain standard. Usually Bluetooth 5.0, which is the current and energy-efficient standard at the time of the device's release. However, software shells such as MIUI can hide detailed information by providing only general information about the module's on state.

In this guide, we will break down all the available ways, from simply viewing the information in the About Phone menu to using the engineering menu and computer utilities. You will learn how to interpret the data and understand how to update the module software if the manufacturer has released a security patch or bug fix for your firmware version. The exact version of Bluetooth on Redmi 9 depends on the regional version of the firmware (Global, EEA, Russia) and may differ by the driver build number.

Standard methods of checking in the settings menu

The most obvious, but not always informative, way is to study the settings section of the operating system. In the MIUI shell that is installed on the Xiaomi Redmi 9, developers have hidden detailed technical information deep in the system reports. The standard Settings → Bluetooth path will show only the status of the on and the list of associated devices, but not the version of the protocol. To get any information without third-party software, you need to go to the About phone section.

You can find all specs here, or click on MIUI Version multiple times to activate the extended menu if it's available in your firmware version. Sometimes you'll find a line in the "Full Info" or "Status" section that shows the radio module assembly number. However, most often you'll only see the general kernel or Android version number, which doesn't give a direct answer to the question about the Bluetooth version. This method is only suitable for the initial assessment of the system status.

If you want to make sure that the module is working correctly at all, you can try pairing with a device that requires a specific version of the protocol. For example, trying to connect modern headphones with aptX HD codec may not succeed if the drivers are outdated or the hardware does not support this standard, in which case the system will issue a pairing error or warn about poor sound quality. This is an indirect but working method of checking functionality.

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Before checking the Bluetooth version, make sure your Redmi 9 has the latest available MIUI installed, as updates often contain patches for wireless module drivers.

Using the Engineering Menu for Diagnostics

A more reliable way to get information about the hardware component of a smartphone is to log in to the engineering menu. On devices with MediaTek processors, which includes Redmi 9, this mode provides access to the tests of all communication modules. To log in, you use a special code entered through a standard call. You need to open the Phone application and type the combination # #3646633#. If the code does not work, it is possible that your version of the firmware blocks this access, and you need to use special activator applications.

Once you've successfully logged into the Engineering Mode, you'll need to go to the Telephony or Connectivity tab, and that's where you'll find your settings and your wireless interface information. BT (You can find a subsection inside. BT Debug Info or Version Info. This is often the chip version, MAC-address and, most importantly, the version of the Bluetooth protocol or stack installed in the system.

⚠️ Warning: Be extremely careful in the engineering menu. RF Test or Audio without understanding their purpose can cause the antenna to malfunction, lose a signal or reset the sound calibration.

In some cases, the information can be presented in the form of hexadecimal codes or abbreviations that only engineers can understand. For example, the HCI Version string may contain a number that needs to be decrypted using the Bluetooth SIG specification. You can also run the Loopback Test, which will check, send and receive signals correctly, and this is a useful tool if you have any suspicions of a physical antenna failure after the device falls.

📊 Which test method seems most convenient to you?
Through phone settings
Engineering menu
Apps from Play Market
ADB computer utilities

Application of third-party applications from Google Play

The most convenient and safe way for the average user is to install specialized applications-identifiers. Google Play store offers dozens of utilities that read system logs and display detailed information about the hardware. For the owner of Xiaomi Redmi 9, the best choice will be applications like Device Info HW, AIDA64 or Bluetooth Scanner. They do not require superuser rights (Root) and work immediately after installation.

Consider an example of AIDA64, where you go to System or Devices, and there's a separate tab or block dedicated to Bluetooth, and it'll show not only the protocol version (e.g. 5.0), but also the list of supported profiles (A2DP, AVRCP, HID) and codecs (SBC, AAC, aptX), which gives you a complete picture of the multimedia capabilities of your Redmi 9.

Another useful utility is Bluetooth Scanner, which not only shows you a version of your module, but also allows you to scan your environment. You can often see the type of device and the technologies they support in the list of devices you find. If your phone sees Bluetooth Low Energy (BLE) devices, then the module is fully functional.

☑️ Checking through the application

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Checking through a computer and ADB-team

For advanced users who are not afraid of the command line, there is a method of checking through debugging. USB. This method provides the most accurate and raw information directly from the Android drivers, USB-cable and installed drivers ADB (On the Redmi 9 itself, you need to activate the developer mode: go to Settings → About the phone and 7 times click on the Version MIUI.

After enabling USB debugging in Advanced Settings → For developers, connect your phone to your PC. Open the command line on your computer and type a command to get a list of all Bluetooth features. This will allow you to see the version of HCI (Host Controller Interface) that matches the Bluetooth version.

adb shell dumpsys bluetooth_manager

This command will give you a lot of text, and you'll search for lines that contain Vendor, Subversion, or HCI Version, and you can use a more specific query through getprop, which displays the system's properties:

adb shell getprop | grep bluetooth

In the getprop output, look for properties that start with ro.bluetooth. For example, ro.bluetooth.version can contain the value you want. If the standard properties don't show the version, you can try querying kernel logs, but that requires a deeper knowledge of Linux. The good thing about this method is that it works even if the phone's screen is broken or doesn't respond to touch, allowing you to diagnose remotely.

What if the ADB can’t see the phone?
If the computer does not recognize the device, check if the driver is installed. ADB Interface. Try replacing it. USB-You can also check if you have a window on your phone asking for permission to debug and you tick "Always Allow".> Understanding which version of Bluetooth your Redmi 9 supports is essential for matching accessories. Below is a table that will help you decrypt the data and understand what to expect from the connection. Different versions of the protocol provide different range, data rate and power consumption. - Max Bluetooth. Speed Range (Open Space) Features 4.2 1 Mbps Up to 50 meters Basic support BLE, High power consumption 5.0 2 Mbps Up to 200 meters (Long Range mode) Improved stability, Dual Audio support (software level) 5.1 2 Mbps Up to 200 meters Direction Finding 5.2 3 Mbps (LE Audio) Up to 240 meters Improved audio, lower latency, new codec LC3 Xiaomi Redmi 9 officially supports Bluetooth 5.0, which means it is fully compatible with all older devices (backward compatibility) and can work with the new 5.1 and 5.2 gadgets, but the functionality will be limited to version 5.0. For example, you will not be able to take advantage of the codec. LC3 or a precise positioning function if they require hardware support for a newer standard. It is important to distinguish between the Bluetooth version and the version of supported profiles. Even with Bluetooth 5.0, if the headphone manufacturer uses the old audio transfer profile, the sound quality will be limited. Checking through the applications described above helps to see the full list of profiles. If the list does not contain aptX or LDAC, then either the phone processor does not support them or the license is not purchased by the manufacturer for this model. Solving problems with connection and update If the verification showed that the Bluetooth version is relevant, but the connection problems persist, it may be a software failure or interference. In the Android environment, temporary files often accumulate, which are the first step of the wireless communication must always be a full conflict. This won’t delete your photos or contacts, but will clear all saved Wi-Fi passwords and Bluetooth pairs. → Connection and sharing → Reset Wi-Fi, mobile networks and Bluetooth. After you reboot your phone, try re-setting the pair. If the problem is intermittent sound or low volume, try turning off the "Absolute Volume Level" in the developer menu. Sometimes this solves compatibility problems with specific headphone models. ⚠️ Note: Updating Bluetooth firmware separately from the main system on Xiaomi is not possible through standard means. All updates to the radio module come exclusively as part of global updates MIUI. Do not attempt to install modified drivers from unverified sources – this may lead to a “bricking” of the communication module. In rare cases, problems are caused by the physical wear of the antenna or oxidation of contacts inside the housing, especially if the phone has been exposed to moisture. If software methods, resetting and flashing do not help, and the Bluetooth version is determined correctly, but the communication is unstable at a distance of less than 1 meter, it is likely that diagnostics are required at the service center. The antenna module in Redmi 9 is integrated into the plume or main board, and its replacement requires professional equipment. Frequently Asked Questions (FAQ) Can I upgrade Bluetooth to version 5.2 through third-party applications? No, this is not possible. The Bluetooth version is determined by the Bluetooth part installed on the factory chip. The software can only fix the bugs in the existing module, but it can't change the physical characteristics of the module or add support for new standards not set by the chipmaker. Why does the phone see the headphones but not connect to them? Most often it's due to a conflict of profiles or a crowded pairing memory. Try removing the device from the list on the phone, restarting both gadgets and doing pairing again. Also make sure that the headphones are in mode (conjugation), not just on. Does the Bluetooth case affect the Xiaomi Redmi 9? Yes, maybe. Cases with metal inserts, magnetic s on the upper screens, or the red s, if the screens are located in the upper part of the screens, or the red s. Does Redmi 9 support simultaneous connection of two pairs of headphones? Hardware Bluetooth 5.0 module allows this, but support for Dual Audio (simultaneous transmission of sound to two devices) depends on the implementation in the shell MIUI. In most cases, the standard MIUI does not have a built-in audio output function to two Bluetooth headsets without the use of third-party applications or modifications of the system.