A modern smartphone is impossible to imagine without wireless data transfer technology, and the Xiaomi Redmi Note 8 Pro is no exception. This popular device, running on the basis of the MIUI shell, offers users advanced functionality for working with peripherals. The correct configuration of the communication module allows not only to transfer files, but also to create stable audio channels for headphones or car systems.
Many owners experience difficulties in initial pairing or loss of connection during operation. Often the problem lies not in hardware failure, but in incorrect software settings or features of the power saving system of Android. In this article, we will discuss in detail all the stages of activation, the subtleties of the hidden menu and methods for eliminating common errors.
Special attention should be paid to firmware versions, as the menu interface may vary slightly depending on the regional version of MIUI. However, the basic principles of the protocol remain the same for the entire ecosystem of the Chinese manufacturer.
Basic activation and device search
The first step is always to turn on the communication module in the system, and you need to go to the control panel, hanging the notification curtain from top to bottom, and there's a Bluetooth icon that you can click on, and if you don't have a quick access icon, you should open the full settings menu through the gear.
Basically, you'll need to find the wireless connection section, depending on the version of the shell, it can be called simply "Bluetooth" or be inside the Connection and Sharing category, and you'll need to move the slider to the active position after you move to this section.
Once activated, the phone will start scanning the airwaves for available gadgets. It's important to understand that only devices that are in pairing mode become visible for search. If you don't see your gadget on the list, make sure it also has detection mode.
The search process can take anywhere from seconds to minutes, depending on the load of the radio channel, while the system analyzes the signals and filters them using security protocols, and if the device is found, its name will appear on the list of available for connection.
Interconnection and coding
When you find a device you want, you click on the name of the device, and the system initiates a handshake procedure, which exchanges encryption keys, and for most modern accessories, like headphones or watches, this process is done automatically without entering the codes.
However, some car systems or older headsets may require confirmation, and both devices may have a digital code that needs to be checked, and if the codes match, confirm the action by pressing the "Plug" or "OK" button.
- 📱 Make sure that both devices are at least 20% charged to avoid a breakdown in connection at a critical moment.
- 🔒 Never accept pairing requests from unknown devices in a public place.
- 🔄 If pairing failed the first time, remove the device from the list and repeat the procedure again.
In rare cases, the system may request PIN-The standard combinations are often 0000 or 1234, but for specific equipment, this data should be searched for in the manufacturer's instructions».
☑️ Checklist of successful pairing
Managing connected devices
Once successfully connected, the Redmi Note 8 Pro provides a wide range of options for managing the device profile. The Bluetooth menu, next to the name of the connected gadget, usually has an arrow or gear icon. Clicking on this element opens up a detailed settings menu for this particular device.
Here you can see the battery level of the accessory if it supports the transmission of such data. Also often available is the option to switch profiles. For example, for an automotive system, you can separately turn on or off the transmission of contacts, call history or audio media stream.
⚠️ Attention: Disabling the Media Audio profile will leave the sound of calls, but the music will stop playing through external acoustics.
The same menu also includes a renaming feature, which is especially useful if you have multiple identical gadgets, such as the left and right earphones are displayed separately, or you want to give the car the name "My Ford" instead of the standard model code.
You don't have to delete the device to shut down, you just have to press the disconnect icon or switch the switch to an inactive state, and saving the profile in memory allows the phone to automatically reconnect the next time it hits the range.
Hidden functions and engineering menu
The MIUI shell hides from the average user a number of advanced settings available through the engineering menu, which uses a special code in the Phone app to log in. Enter the combination ##6484## to run the CIT hardware testing menu.
You have to find a Bluetooth item on the test list, usually called the Bluetooth Test or BT, where you can run a module diagnostic, check the version of the chip, and even initiate a forced search, bypassing the standard system constraints.
Is the engineering menu dangerous?
There's also the option to change the audio codec, and by default, the system chooses the best option, but enthusiasts can try switching to aptX or LDAC to improve audio quality if the headphones support these technologies, and this is done through a hidden developer menu.
To open the developer menu, you need to quickly click on the MIUI version number 7 times in the About Phone section. After the "You became a developer" notification appears, a new option will appear in the advanced settings, and you can find Bluetooth settings, including codec selection and connection stability.
Diagnostics and problem-solving
Despite the reliability of the Xiaomi Redmi Note 8 Pro, there are sometimes wireless interface failures, and the most common problem is that the phone "sees" the device but does not connect, or the connection is constantly broken, and in 90% of cases this is solved by software methods.
The first thing to do is clear the cache and data of the Bluetooth service. This will not delete your stored devices, but will reset the current hanging processes. To do this, go to Settings → Apps → All Apps, search in the list of “Bluetooth” (or “Bluetooth MIDI”, “Bluetooth Share”) and select “Clean”.
| Symptoms. | Possible cause | Method of decision |
|---|---|---|
| Can't see the device. | Geolocation off. | Turn on GPS in the curtain |
| A quiet sound in the headphones | Unsynchronized volume | Turn off "absolute volume" |
| Persistent breaks | Wi-Fi interference 2.4 GHz | Switch Wi-Fi to 5 GHz |
| No file is being transferred. | No permission to access | Give permission in the Mi Drop app |
Another common cause of problems is frequency conflict. The Wi-Fi and Bluetooth modules in the Redmi Note 8 Pro run in the 2.4 GHz band. If you download a heavy file over Wi-Fi, the speed or stability of Bluetooth may drop. In such cases, switching the router to 5 GHz helps.
💡
If the sound in your headphones is quieter after you upgrade, try turning off the option "Absolute Volume" from the developer menu, which will de-synchronize the volume sliders of your phone and headphones, which often solves the problem.
Energy optimization and safety
MIUI is known for its aggressive energy saving policy, which can kill Bluetooth background processes. If your fitness bracelet stops syncing data or your headphones turn off when the screen is off, you need to set up autostart.
Go to the Security app (green lightning icon), select Permissions, and find the app that controls your device (such as Mi Fit or Zepp). Make sure it is allowed to auto-start and operate in the background. Also, select No Limits mode in the battery settings for this app.
- 🔋 Turn off the Device Search feature in Bluetooth settings when it is not needed to save battery power.
- 👁️ Regularly remove old, unused devices from the list so as not to clutter the pairing table.
- 🛡️ Avoid using public Bluetooth hotspots to transfer files, as the protocol may be vulnerable.
Data security is also important: When transferring files via the standard OBEX protocol, always confirm acceptance only from known senders. In public places, it is better to keep the visibility of the phone off to avoid spam attacks "Bluejacking".
⚠️ Warning: Do not use third-party applications to “boost Bluetooth signal” from unverified sources. They often contain advertising and malicious code, and do not give real power gain to the antenna, as this is a hardware limitation.