Many owners of the new acoustics face a baffling request when trying to sync a gadget with a smartphone.The Android or iOS system may suddenly require a security code, claiming the device cannot be connected without it. Xiaomi Buds 4 users often panic, believing that somewhere there is a secret combination of numbers printed on a box or in the instructions.
In fact, the Xiaomi Buds 4 and its access codes have their own technical nuances that are rarely covered in official manuals. In most cases, the code requested is the standard Bluetooth protection protocol, not the unique protection against theft. Understanding the nature of this request will help you avoid unnecessary actions to reset settings.
In this article, we will discuss in detail where this request comes from, how to respond to the PIN requirement correctly, and what to do if the headphones stop seeing the phone, and you will learn about standard factory passwords and methods of forced soldering of the connection if software methods do not help.
Nature of the security code request when connecting
When you first remove the Xiaomi Buds 4 from the case, they go into pairing mode.If your phone has not previously been associated with that device, the operating system initiates a handshake of the Bluetooth protocol. Querying the security code is often the OS's automatic response to trying to connect a device with a certain security profile or low charge level.
It is important to understand that the security code in this context is not a password from a Wi-Fi router or an unlock code. SIM-This is the standard trust check mechanism between two devices. For most Xiaomi accessories, including the Buds 4, manufacturers use unified factory combinations that are sewn through the production stage.
There is a common misconception that the code is different for each instance, and in practice, if the system requests input, it means that the automatic encryption key exchange has not been successful, often when using older versions of Android or when there is a conflict of connection profiles in the system.
⚠️ Warning: Never enter arbitrary sets of digits more than three times in a row.Repeated incorrect security code entry can temporarily block the Bluetooth module on your smartphone or cause network settings on the device itself to reset.
If you see a code request, first check if it's not an attempt to connect your device. In rare cases, if neighbors are also using Xiaomi Buds 4 and are in pairing mode, your phone may try to connect to their gadget. Make sure you choose your device in the list of available devices.
Xiaomi Standard Codes and Factory Passwords
Xiaomi engineers, like many other electronics manufacturers, use standard SSP (Secure Simple Pairing) protocols. However, static codes may be requested to be backward compatible with older devices or in case of protocol failures. For Xiaomi products, the most common universal code is the 0000 combination.
If the four zeros don't fit, the next most popular combination for the brand's devices is 1234, which covers 95 percent of all cases where the system requires manual verification. OEM-components, may occur code 8888.
It is worth noting that modern Xiaomi Buds 4 uses Fast Pair technology, which does not require user input at all. The appearance of the input field means that the connection was an outdated scenario or in the Bluetooth cache of your phone there are erroneous data about previous connection attempts.
The table below shows the main combinations that may be required under different Xiaomi acoustics connectivity scenarios:
| Connection scenario | Probable code | Probability of success |
|---|---|---|
| Standard pairing | 0000 | Tall. |
| Alternative protocol | 1234 | Medium |
| Rare. OEM-party | 8888 | Low. |
| Reset to factory | Not required | - |
These codes are only valid when you first connect or when you completely reset your headphones. If the device has previously successfully paired and suddenly requested the code again, it is a software failure signal that requires cleaning the list (of the associated devices).
The procedure for a complete reset of headphone settings
If standard codes fail or the connection is interrupted, the (most effective) method of solving the problem is to completely reset the Xiaomi Buds 4 settings to factory state, which removes all stored connection profiles from the case memory and the headphones themselves.
To do the reset, place both earbuds in the charge case and leave the lid open. Find the function button on the case case case (usually located on the back or inside between the headphone compartments). 10-15 seconds.
☑️ Reset algorithm Xiaomi Buds 4
The status indicator will flash white, then go into fast blinking mode, which signals a successful reset. After that, the headphones will go into active search for a new device, and the old security code will no longer be relevant.
⚠️ Warning: During the reset procedure, make sure the case is at least 30% charged. Interrupting the reset process due to battery discharge can cause the left and right earphones to become unsynchronized, after which they will work independently of each other.
After reset, be sure to remove the device from the Bluetooth list on your smartphone. Find Xiaomi Buds 4 in the list of previously connected devices, click on the gear icon or information icon and select the option “Forget the device” or “Disable”.
Working with the Xiaomi Earbuds app
To manage Xiaomi Buds 4 and deep customization, it is recommended to use a specialized application Xiaomi Earbuds (or Mi Buds for older versions).It allows you to update the firmware of the headphones, which often eliminates Bluetooth protocol bugs that cause code requests.
The app can request permission to access geolocation and Bluetooth, which is necessary for the fast search and charge display function to work properly. If the app can't see the headphones, try clearing the app's cache in the Android settings.
Inside the application, you can (check) the current version of firmware. If a new version is available, be sure to install it by putting the headphones in the case and connecting the case to the charger. A firmware update often contains security patches that change the handshake protocol algorithms.
What to do if the app does not see the headphones?
You can also reset your settings through the app if the physical buttons on the case don't respond. In the device menu, look for the "About Headphones" or "Settings" section where the "Reset" button can be located. This is the software analogue (long press) to the case button.
Resolving Bluetooth Profile Conflicts
A common reason for a security code request is a crowded list of conjugate devices on a smartphone. If more than 10-15 devices are stored in a phone’s memory, the system may not properly process new connection requests, requiring manual verification.
It is recommended to periodically clean the list of Bluetooth devices, removing those that you have not used for a long time (old speakers, lost trackers, TVs in the office).
Another reason could be caching faulty encryption keys, in which case a hard reboot of the Bluetooth stack helps; on Android, you can do this by turning on flight mode for 10 seconds and then turning it off. On iOS, it helps to reboot the smartphone itself.
- 📱 Remove all old and unnecessary devices from the Bluetooth list in your phone settings.
- 🔄 Turn off and turn on Bluetooth on your smartphone after removing devices.
- 🔌 Charge the Xiaomi Buds 4 case to 100% before re-attempting pairing.
If the problem persists, try connecting your headphones to another device (tablet, laptop, or friend's phone) and if the other device doesn't request code or the connection is successful, the problem lies in the settings of your main smartphone.
Specific problems of operating systems
iOS (iPhone) users encounter code requests less often, but if this happens, the system usually offers standard options: “Do Not mate”, “Pair” or enter a PIN. Xiaomi Buds 4 on iOS is characterized by problems with the display of animation, but not with security codes.
On Android, especially custom firmware (MIUI, HyperOS, OneUI), conflicts can arise due to aggressive energy savings. The system can “sleep” the Bluetooth module, which leads to the break of the handshake protocol and re-query the code when you try reconnect.
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Add the Xiaomi Earbuds app to the battery exception list (“No Limits”) so that the system doesn’t interrupt the background connection to the headphones.
In some cases, network resets help. This is a radical method that will delete all stored Wi-Fi passwords and Bluetooth devices, but often solves the underlying problems of the communication stack. → System system → Resetting settings → Resetting Wi-Fi, Mobile Internet and Bluetooth.
It’s also worth checking if the phone is on Phone Only mode or similar restrictions that can block the A2DP profile (sound transfer) leaving only the HFP profile active (headset), which sometimes causes authorization errors.
Frequently Asked Questions (FAQ)
Where exactly is the security code for Xiaomi Buds 4 written?
What if the phone says “I couldn’t hide” after entering the code?
Can the security code change after the firmware update?
Is the code requested when connecting to a laptop?
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In 99% of cases, the problem is solved by standard code 0000 or a complete reset of headphones to factory settings.