Modern wireless headsets have become an integral part of everyday smartphone use, and the i12 series is at the forefront of the budget segment due to its affordable price and compact design. However, owners of devices from Xiaomi, Redmi and POCO often face nuances of pairing that are not obvious when they first get acquainted with the gadget. Synchronization can not go smoothly due to the features of the MIUI shell or HyperOS, which require careful approach to Bluetooth settings.
In this article, we’ll take a closer look at the entire process, from initial activation to fine-tuning the audio stream so you can enjoy music without delays and connection breaks. Proper connectivity not only ensures stable sound, but also extends the battery life of both the headphones and the smartphone itself.
You will learn how to enter the device in search mode, what system settings can block the connection and what to do if the phone “sees” only one headphone from a pair, this knowledge will avoid common mistakes and save time on troubleshooting.
Preparation of i12 headphones for the first turn on
Before you try to find the device in the list of available networks, you need to make sure that the headset is fully ready to work. Charge the case and the headphones themselves for at least 30-40 minutes, as they often come with a minimum charge level for storage in stock.
After charging, remove both earbuds from the case at the same time, at which point they should automatically turn on and start flashing indicators, indicating a transition to pairing mode. If the indicators are not burning, you may need to remove the protective film from the contacts on the headphones themselves, which often blocks the current on the first use.
It’s important to wait until one of the headphones (usually the right one) flashes red and white faster than the other, which means the master device is actively looking for a phone to transmit the audio signal to the second channel. If this does not happen, you may need to reset the headset settings to the factory, clamping the touch panels on the 10-15 seconds.
⚠️ Warning: Do not try to connect only one headphone to the phone for verification.To properly operate the stereo mode and synchronize the microphones, both devices must first be paired with each other inside the case or while retrieving the case.
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Before the first connection, wipe the metal contacts on the headphones and inside the case with a dry soft cloth - oxidation can prevent proper charging and automatic on.
Setting up Bluetooth interface on Xiaomi
The Android operating system interface with the MIUI shell has its own features of managing wireless modules. First, unlock the smartphone screen and lower the notification curtain from the top down. Find the Bluetooth icon and click on it to activate the module, or pinch it to go to advanced settings.
In the settings menu, make sure that the option “Visibility for other devices” is active, although on modern versions of Android this is often enabled by default when you open the menu. Xiaomi’s system may suggest enabling geolocation for more accurate device definition – agree with this, since the BLE (Bluetooth Low Energy) protocol used in the i12 depends on location services.
Note the "Available Devices" list, and if your headphones have previously been connected to another gadget, they may not be displayed in the general list, but hidden in the "My Devices" section, in which case you must force the headset to search mode, re-placing it in the case and bringing it back.
The process of pairing the device with the phone
When the Bluetooth module is active and the headphones are in search mode, the list of available devices should appear as i12 TWS or simply i12. Click on this line to initiate the connection process. The pairing occurs automatically, without requesting a pin code, however, in rare cases the system can request the code 0000 or 1234.
When you connect, a system window may appear on your smartphone screen requesting permission to access contacts and call logs. Allow this access if you plan to use the headset for conversations, otherwise the microphone may not activate when you call. After a successful connection, the headphone battery icon will appear in the status bar, which is typical for devices that support the charge transfer protocol.
If the connection is established but no sound, check the connection profile. In some cases, the phone only connects the device as Audio (for music) but not as Calls. Go to Bluetooth settings, tap the gear next to the i12 and make sure all switches are activated.
☑️ Connection checklist
Solving Visibility and Connection Problems
Quite often, users are faced with a situation where the phone sees the device, but the connection does not occur or immediately breaks. This can be caused by a conflict of the cache of Bluetooth services. Try in the Bluetooth settings to find previously saved devices, select i12 and click "Forget this device" or "Unpair".
After deleting the profile, repeat the procedure for putting the headphones into pairing mode. Make sure that there are no other active Bluetooth devices nearby that can intercept a signal or cause interference in the 2.4 GHz band. Interference from Wi-Fi routers or microwave ovens can also temporarily disrupt the stability of the connection.
In case the problem persists, perform a full reset of network settings on your smartphone.This action will not delete your personal files or photos, but will return to factory settings for Wi-Fi, Bluetooth and mobile networks, which often eliminates software errors.
| Symptoms. | Possible cause | Method of decision |
|---|---|---|
| Headphones flashing but not found | The pairing mode is not activated | Put it in a case, get it out at the same time. |
| Only one headphone is connected. | Synchronization between L and R is broken | Resetting headphone settings (clamping the sensor) |
| The sound is interrupted. | Low charge or interference | Charge the device, move away from the router |
| No sound in games. | High codec latency | Use wired or gamer models |
⚠️ Warning: If you have a problem with your phone after resetting your Bluetooth settings, try connecting your headphones to another smartphone. If they don't work there, the module itself is probably faulty. i12.
Elimination of left and right channel dissynchronization
One of the most common budgetary problems TWS-The model is desynchronized, where the music is only playing in one ear and the second ear is silent or talking, which means that the stereo pair has broken up, and the phone is only connected to one of the modules.
Remove the i12 from the Bluetooth list on your phone and turn off Bluetooth on your smartphone. Place both headphones in the charge case, close the lid and wait 10 seconds. Then pull them out at the same time and wait until they start flashing quickly, signaling to find each other.
Once the indicators on both headphones start flashing slowly (standby mode), turn on Bluetooth on your phone and search again. Successful pairing will be confirmed by a voice message "Connected" or a characteristic beep in both ears at the same time.
Technical details of synchronization
Optimizing sound quality and energy consumption
After a successful connection, it is recommended to perform basic optimization to improve the user experience. In the Bluetooth settings, in the Audio Codec section, try switching mode from SBC to AAC if your Xiaomi model and Android version support this format. The AAC codec provides better compression quality and less high frequency losses when transmitted over the air.
To save battery power, turn off the Absolute Volume feature if it's active. Sometimes this feature causes conflicts between the volume level of the phone and the headset itself, which can make the sound too quiet even at maximum. Adjust the volume directly by touching the touch zones on the headphones.
Keep an eye out for firmware updates if the manufacturer has released a companion app for your i12 version. While most of these models work on the Plug-and-Play principle, specialized utilities allow you to update firmware, eliminating connection bugs and improving noise cancellation.
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Using an AAC codec instead of a standard SBC can significantly improve the quality of music playback on Xiaomi devices, but increases energy consumption by about 10-15%.