If you own a TV or other Xiaomi device with a feature RFB, But you still don't understand what it is or how it works -- you're not alone. This term is often confusing, especially among new users of the brand's technology. RFB (Radio Frequency Backchannel is a wireless feedback technology that is used in modern devices to improve interaction between remote controls and the gadgets themselves.
In this article, we will understand what is RFB In Xiaomi, you can put it into practice, from basic principles to the finer points of customization and troubleshooting, and learn which models support this feature, how to activate it, and why it can be useful (or, conversely, create problems). TV Redmi Smart TV, where RFB most sought after.
It is important to note that RFB — It's not just wireless, it's a specific protocol that has its own characteristics, like allowing the remote to work without direct vision with the TV, but it requires the right channel setup. If you are faced with a situation where the remote stopped responding after updating the firmware or changing the location of the devices - most likely, the problem lies in the fact that the remote control has stopped responding. RFB.
What is it? RFB How it works in Xiaomi devices
RFB (Radio Frequency Backchannel is a two-way radio communication technology between a remote control and a device (most often a TV (IR) control, where the signal is transmitted only in one direction (from the remote to the TV), RFB This means that the TV can respond to the remote by confirming the execution of commands or reporting errors.
In Xiaomi devices RFB It's implemented over a 2.4 GHz radio channel (similar to Wi-Fi or Bluetooth, but with a different protocol:
- 📶 Control the TV without direct sight (for example, from another room or when the remote is pointing to the side).
- 🔄 Get feedback from the TV (for example, vibration of the remote when you press a button or notification of low battery charge).
- 🔋 Save the battery power of the remote due to an optimized communication protocol.
- 🛡️ Increased protection against interference compared to IR (infrared.
But RFB There are also disadvantages. For example, a radio signal can conflict with other devices at 2.4 GHz (routers, microwaves, wireless headphones). In addition, not all models of remotes and TVs Xiaomi support this technology — its availability depends on the year of release and serial number of the device.
What Xiaomi devices support RFB
Technology RFB Not available on all Xiaomi devices, it first appeared in the Mi series TVs. TV 4 (2018) and later integrated into newer models, below is a list of devices where RFB officially maintained:
| Device series | Models with RFB | Year of release | Notes |
|---|---|---|---|
| Mi TV 4 | Mi TV 4A, Mi TV 4C, Mi TV 4S | 2018–2019 | Requires a remote with a marking RFB back-panel. |
| Mi TV 5 | Mi TV 5, Mi TV 5 Pro, Mi TV 5X | 2020–2021 | RFB It is on by default, but can be turned off in settings. |
| Redmi Smart TV | Redmi Smart TV X55, X65, X75 | 2021–2023 | Support RFB Depends on the region of sale. |
| Xiaomi TV A | Xiaomi TV A55, A65, A75 | 2022–2026 | RFB It only works with original remotes. |
To check if your device supports RFB, Follow the following steps:
- Go to Settings → Devices → Remote DU.
- See if there is a connection type or RF Mode.
- If the menu is a Radio Frequency or 2.4G — Your TV supports you RFB.
Please note that even if the TV supports RFB, It needs a special remote control unit with a radio module. IR-Infrared remotes will not be able to take advantage of this technology.
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If you have lost the original remote control RFB, You can buy a universal radio frequency remote from Xiaomi (for example, the model Mi Remote Controller Pro) – it is compatible with most TVs of the brand.
How to turn on and set up RFB on Xiaomi TV
If your device supports you RFB, But it's not working, it's probably just disabled in the settings:
- Check remote compatibility: Make sure your remote supports RFB (There should be an inscription on the back. 2.4G or RF).
- Activate. RFB menu: Open the settings → Devices → Select the type of connection or RF Mode, switch mode to C. IR on RF (or 2.4G).
- Sync the remote: Press and hold the Menu buttons + OK You can use the remote for 5 seconds, wait for the indicator to flash on the remote (signal to start syncing), and the TV will show a notification of successful connection.
If the synchronization fails, try the following steps:
- 🔄 Restart the TV (turn off the network for 30 seconds).
- 🔋 Replace batteries in the remote (discharged cells may interfere with the RFB-linkage).
- 📡 Make sure there are no sources of interference (routers, microwaves) nearby).
☑️ Verification of work RFB
Important: After inclusion RFB infrared (IR) It automatically shuts down. If you want to take back control, IR, You will have to manually switch the mode back in the settings.
Common problems with RFB and their decisions
Despite the advantages of technology RFB These are the most common problems and how to fix them:
⚠️ Note: If after updating the firmware remote stopped working RFB, Try resetting the remote. To do this, press and hold Back. + Home in 10 seconds, and that'll bring the remote back to the factory settings, but all the connected devices will have to be reconnected.
| Problem. | Possible cause | Decision |
|---|---|---|
| Remote is not responding to pressing | Batteries are discharged or synchronization is lost | Replace the batteries and reconnect the remote (see instructions above). |
| Delay in pressing buttons | Interference from other devices at 2.4 GHz | Move your router or TV away from sources of interference. |
| The remote works only near the TV. | Weak signal. RFB or obstacles (walls, furniture) | Check if there are physical barriers between the remote and the TV. |
| RFB shuts down on its own | Firmware failure or conflict with other wireless devices | Update your TV to the latest version. |
If none of these solutions worked, try resetting the TV to the factory settings.
- Go to Settings → About TV → Reset settings.
- Select Restore Factory Settings.
- Confirm the action (maybe you need to enter) PIN-default code 0000 or 1234).
After resetting all settings, including RFB, You're going to have to reconfigure your Wi-Fi connection, your accounts, your other settings.
What if the reset didn't help?
RFB vs IR: What is best and when to use
Many users are wondering what type of management is best — RFB traditional IR? The answer depends on your needs. Let's compare the two technologies:
- 🔍 IR (infrared): ✅ Simplicity and reliability (always works if there are no obstacles). ✅ Low power consumption of the remote. ❌ Requires direct visibility between the remote and the TV. ❌ No feedback (no one can know if the team worked).
- 📡 RFB (radiofrequency): ✅ It works without direct vision (can be controlled from another room). ✅ Supports feedback (vibration, notifications). ✅ Less exposed to interference from sunlight. ❌ Can conflict with other devices at 2.4 GHz. ❌ Higher power consumption of the remote.
When to use RFB:
- 🏠 If the TV is installed in a niche or behind a glass door (where IR fails).
- 🎮 For gamers who want to control TV without turning away from the game.
- 🔋 If you are interested in feedback (for example, confirmation of on/off).
When is the best time to stay IR:
- 🏡 In homes with a large number of wireless devices (to avoid interference).
- 🔋 If you rarely use the remote and want to maximize the life of batteries.
- 🛠️ If you have an old TV without support RFB.
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RFB It is more convenient for everyday use, but IR It's more reliable in heavy interference, and the best option is a remote control with both modes (for example, Mi Remote Controller Pro).
How to update the firmware to improve the work RFB
If RFB It's unstable, it can be caused by the TV's outdated firmware. Xiaomi regularly releases updates that fix communication errors and add new features:
- Automatic Internet Update: Connect your TV to Wi-Fi. Go to Settings → On TV. → Update system. Click Check for updates and wait until the process is complete.
- Manual update through USB (If the automatic does not work: Download the latest firmware for your model from the official Xiaomi Support website. Unpack the archive and copy the.zip file to a flash drive (formatted in the file format) FAT32). Insert the flash drive into the TV and select Settings → On TV. → Update through USB.
After the update:
- 🔄 Restart the TV.
- 🔧 Re-sync the remote (if you have to do so). RFB lost).
- 📋 Check the firmware version in Settings → On TV.
⚠️ Note: Do not turn off the TV during the update USB — If the process is stuck in the Installation phase, wait 15-20 minutes. If nothing has changed after that time, contact Xiaomi for support.
After the update RFB It stopped working at all, try rolling back the firmware to the previous version:
- Download the old version of the software from the forums (for example, 4PDA).
- Set it up through USB (manually).
Alternatives RFB: Other Ways to Control Xiaomi TV
If RFB For some reason, you may not be able to use alternative methods to control the Xiaomi TV:
- 📱 Mi Remote: Download the app to your smartphone (available for Android and iOS). Connect to the same Wi-Fi network as your TV. Select a TV model from your device list and sync. Advantages: no need to search for a remote, you can control your voice (via Alice or Google Assistant). Disadvantages: Requires a stable Wi-Fi connection.
If you prefer a physical remote, but RFB It is not good, you can buy universal. IR-Remote (e.g. Xiaomi Mi Universal Remote) is compatible with most TVs and does not require customization RFB.