Wireless headphones model TWS F9 gained popularity due to their affordable price and convenient case with the Power Bank function. However, new owners often have a question about how to correctly perform the initial pairing with a device based on Androidto avoid desynchronization of the left and right channels. The setup process seems simple, but has its own technical nuances, which, if ignored, results in the gadget seeing two different devices instead of one stereo complex.
In this guide, we will analyze in detail the algorithm of actions for a successful connection, consider typical Bluetooth interface errors and suggest ways to force reset the headset settings. The correct sequence of turning on the case and removing the earbuds is a critical factor to establish a stable connection between the headphones themselves before transmitting the signal to the smartphone.
If you have just unpacked the device or encountered problems after updating the phone’s firmware, these instructions will help restore the functionality of the audio accessory. We use proven methods that are relevant for most Android shells, from pure Pixel UI to custom firmware MIUI and OneUI.
Preparing the headphones for the first use
Before starting the pairing procedure, you need to make sure that the battery of the case and the earbuds themselves are charged at least 30%. The indicators on the front panel should light up when the cover is opened, indicating readiness for operation. If the LEDs do not respond, connect a charging cable type Micro-USB or Type-C (depending on the model revision) to the port on the case.
It is important to understand that new headphones often come from the factory in deep energy saving mode or with a protective film on the charging contacts inside the case. Remove all protective stickers from the metal contacts on the legs of the headphones, otherwise they will not be able to charge and turn on when removed. This is a common mistake that makes users think that the device is faulty.
⚠️ Warning: Do not try to connect the headphones to the phone while they are inside the case. Pairing mode is activated only when both earbuds are physically removed from the charging compartment.
After checking charging, remove both earbuds at the same time. You should hear a characteristic beep or see the indicators flashing quickly. At this moment there is an automatic searching for a partner between the left and right channels. Only after they find each other, one of them (usually the right one) will go into standby mode for connecting to an external device.
If the indicators blink in turn with a large interval, then the headphones are not synchronized with each other. Return them to the case for 5 seconds and take them out again at the same time.
Activating pairing mode on a smartphone
To start working with the peripherals, you need to unlock the screen of your smartphone and go to the main settings menu. Find the section responsible for wireless connections. Depending on the version of the operating system, the path may differ, but the logic remains the same for the entire ecosystem Android.
Go to the menu along the path Settings → Connected devices → Bluetooth. Make sure the activation slider is switched to the "On" position. If you're using the notification shade, make sure the Bluetooth icon is blue or active. Now the phone will start scanning the airwaves for available gadgets.
- 📱 Check that Airplane mode is disabled, as it blocks all radio modules.
- 🔍 Make sure the smartphone is not trying to connect to another known one device automatically.
- 📍 Keep the case with headphones at a distance of no more than 1 meter from the phone for reliable signal reception.
The name F9 TWS or simply F9should appear in the list of available devices. Sometimes the system can identify them as Wireless Headset. If you see two identical names, it means that the sync between the headphones themselves has failed and the phone sees them as two mono devices. In this case, connecting to one of them will not provide stereo sound.
The process of connecting and synchronizing channels
Click on the device name in the list of found gadgets on the smartphone screen. The system will ask you to confirm pairing, and after a few seconds you will hear a voice notification “Connected” or a characteristic sound in the headphones. The indicator on the body of one of the earbuds should stop blinking and either go out or glow dimly, which signals a successful connection.
The key point here is master device. In TWS technology, one earphone acts as the leader (Master), transmitting the signal to the second (Slave). When you connect for the first time, this role is assigned automatically. If you have connected only one earphone, and the second one is in the case, when removing the second one, you may need to press it again to activate the stereo mode.
Sequence of actions:1. Remove the LEFT and RIGHT headphones.
2. Wait until they stop blinking quickly (synchronizing with each other).
3. Turn on Bluetooth on your phone.
4. Click on F9 TWS in the list.
Sometimes it is useful to check the developer settings if the connection is unstable. In the menu Settings → For developers you can find the item "Bluetooth AVRCP Version". Changing the value from 1.4 to 1.5 or 1.6 can improve the transfer of track metadata and connection stability for some chip models.
☑️ Checklist for successful connection
Diagnostics of connection problems
Even if everything is observed Following instructions, situations may arise when the smartphone does not see the headset or the connection is lost after a few seconds. Often the reason lies in the operating system's Bluetooth services cache or a conflict in the profiles of previously connected devices. Clearing the list of paired devices is the first step to solving the problem.
Go to the Bluetooth settings, find the entry in the "Paired devices" list F9, click on the gear icon next to it and select "Disconnect" or "Forget the device." After this, turn off Bluetooth on your phone, restart your smartphone and repeat the search procedure again. This allows you to reset erroneous protocol handshakes.
| Symptom | Possible cause | Solution method |
|---|---|---|
| Phone does not see headphones | Low battery | Put it in the case to charge for 20 minutes |
| See two devices F9 | No synchronization between L and R | Reset headphone settings (Hard Reset) |
| Sound in only one ear | Mono mode or dirt in the grid | Check the sound balance and clean the grid |
| Frequent disconnections | Wi-Fi interference or distance | Move away from the router or move closer to phone |
⚠️ Attention: If you see two devices named F9 in the list, delete both from the phone's memory before trying to connect again. Connecting to one of them in this state will result in only one channel working.
It is also worth checking if the power saving mode is activated on your smartphone, which may limit the operation of background Bluetooth services. In some shells, for example MIUI or ColorOS, you must manually allow the "Bluetooth" application to run in the background and disable battery optimization for it.
Reset headphone settings to factory settings
If standard methods do not help, you need to perform a full reset (Hard Reset) of the headset itself. This procedure removes the entire pairing history from the memory of the headphone chips and returns them to their “out of the box” state. For the model TWS F9 there are several combinations of actions, since the manufacturer can change the firmware.
The most common method: place both headphones in the case, leaving the lid open. Press and hold the touch zones on both earbuds at the same time for 10-15 seconds. The indicators should flash red several times and then go off. This is a signal that the memory has been cleared.
Alternative reset method
If the sensors do not respond, try quickly turning Bluetooth on and off on the smartphone itself 5 times while being next to the headphones in search mode. In rare cases, this will initiate a forced reset of the protocol.
After the reset, be sure to remove the device from the Bluetooth list on your phone (“Forget device”). Only then take the headphones out of the case. They should start flashing white or blue-white quickly, indicating they have entered the default_pairing_mode.
Setting up sound and touch controls
After successful connection, you should customize the touch controls for yourself. By default, the model F9 has preset gestures, which may be inconvenient. Typically, double-tapping the right earbud is responsible for play/pause, and triple-tapping for calling the voice assistant.
For more fine-tuning, you can use third-party applications from Google Playsuch as Button Mapper or specialized utilities for TWS, if they support your chipset. However, basic functions such as volume control (often holding the touch for a long time) and switching tracks operate at the hardware level.
- 🎵 Double tap: Pause / Answer call.
- ⏭️ Triple tap: Next track / Reject call.
- 📞 Long press (2 sec): Voice assistant / Mute microphone.
Please note that the sensitivity of the sensors depends on the tightness of the earphone to the ear. If the command does not work, try pressing the earbud tighter or changing the angle. Microphone In this model, it is built into each earphone, which allows you to use them separately for calls.
The sensors work on the principle of capacitive contact. Make sure your fingers are dry and warm to register touches correctly, especially in winter.
Frequently asked questions (FAQ)
Why does the phone see two F9 devices instead of one?
This means that the left and right headphones have lost synchronization with each other and are working independently mono mode. You need to perform a Hard Reset, keeping the sensors of both headphones in the case, and then reconnect them to the phone.
Is it possible to use only one F9 earphone?
Yes, the model supports mono use mode. You can remove only the right or only the left earphone from the case. The second one must remain in the case or be turned off. The sound will be automatically redirected to the active channel.
The headphones are quickly discharged, what is the reason?
Perhaps the contact pads in the case or on the headphones themselves are dirty, which is why they do not charge to 100%. Wipe the contacts with a dry cotton swab. Also check if the volume is always at maximum, which speeds up energy consumption.
How to update the firmware of F9 headphones?
Budget TWS F9 models usually do not support OTA updates via the app. The firmware is programmed into the chip at the factory. If the device does not work correctly, the only solution is to completely reset the settings to factory settings.
Why is there no sound when watching a video on YouTube?
Check in the Bluetooth settings whether the "Multimedia" and "Phone" profiles are activated for the connected F9 device. Sometimes the audio profile turns off accidentally. Also make sure that in the phone's sound settings, the output is not switched to the smartphone speaker.