If your Xiaomi Redmi loses connection to headphones more than a meter away or music is constantly interrupted, the problem lies not in cheap accessories, but in the settings of the smartphone itself. A weak Bluetooth signal is one of the most common complaints of owners of budget and flagship Redmi models, from the Redmi Note 10 to the Redmi K60. The reasons can vary from the software limitations of MIUI to the hardware features of the antenna.
In this article, we’ll look at 7 proven ways to enhance Bluetooth, from basic settings to radical solutions like custom core firmware. You’ll learn how to increase the range of the connection to 15-20 meters under ideal conditions (versus the standard 5-10 m), reduce sound delays and avoid communication interruptions. All methods are tested on current Redmi models (2022-2026) and do not require root rights, unless otherwise stated.
1. Optimizing Bluetooth settings in MIUI
The first thing to check is the hidden Bluetooth settings that Xiaomi defaults to save power. Even if you’ve never changed the settings, the system can automatically reduce the transmission power to save battery power.
How to turn on maximum power:
- 📱 Open the Settings. → Connections and sharing → Bluetooth.
- 🔍 Tap the three-point menu (⋮) in the upper right corner and select additional.
- 🔋 Scroll down and find Bluetooth Power Saving Mode – turn it off.
- 📶 Enable the option Priority Sound Quality (if available).
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If your MIUI version doesn’t have “Advanced” option, try turning on Developer Mode (7 times tap on the MIUI version in About Phone), then in Developer Settings, find Bluetooth Audio Codec and select SBC or AAC instead of aptX – this will reduce delays.
You should also check out the Bluetooth version of your Redmi protocol:
| Model Redmi | Bluetooth version | Max. range (theory) |
|---|---|---|
| Redmi Note 12/13 | 5.3 | 10-15 m |
| Redmi K50/K60 | 5.3 | 12–20 m |
| Redmi 10/11 | 5.0 | 8-12 m |
| Redmi 9/9A | 4.2 | 5-10 m |
⚠️ Attention: Redmi with Bluetooth 4.2 (Like Redmi. 8/9) Attempts to amplify the signal programmatically will give an increase of no more 1–2 meters.
2. Update of firmware and Bluetooth drivers
Driver errors are a common cause of unstable Bluetooth. Xiaomi regularly releases bug fixes, but many users ignore updates for fear of “brakes.” However, in the case of Bluetooth, updating MIUI to the latest version can increase the range of the connection by 20-30%.
How to update drivers:
- Go to Settings → About the phone → System update.
- Click Check Updates and install the latest stable version.
- After the update, reset Bluetooth settings: Settings → Connections → Bluetooth → ⋮ → Resetting settings.
If the update didn't work, check regional firmware. For example, on the Redmi Note 11, Bluetooth is more stable in Indian (IN) firmware than in global (EEA) to change region:
How to change the firmware region without unlocking the bootloader
⚠️ Warning: Changing the region may result in a loss of warranty if the phone was purchased from an official store.Before the procedure, back up the data via Settings → Additionally. → Backup.
3. Use of external Bluetooth adapters
If software methods have failed, consider hardware amplification. External Bluetooth adapters connect via USB-C or OTG and can increase the range to 50-100 meters (depending on the model), this is true for Redmi with outdated Bluetooth 4.2 or for connecting to smart devices (for example, Xiaomi Mi Smart Speaker speakers).
Top.-3 Adapter for Xiaomi Redmi:
- 🥇 Avaca Bluetooth 5.0 USB — range up to 20 m, support for aptX, price ~1500 ₽.
- 🥈 TP-Link UB500 — compact, compatible with MIUI, 15m range.
- 🥉 ASUS USB-BT500 — Low power consumption, ideal for Redmi K50.
How to connect:
- Buy it. USB-C OTG-Adapter (if not included in the package).
- Connect the Bluetooth adapter to your phone.
- In Settings → Connections, select a new device.
- Turn off built-in Bluetooth in Settings → Bluetooth → ⋮ → Shut down.
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The external adapter completely replaces the built-in Bluetooth module. This is the only way to get Bluetooth 5.2/5.3 on older Redmi models (such as the Redmi 7/8).
4.Tune audio codecs to reduce delays
If the problem is not range, but audio interruptions or delays (for example, when watching a video), the wrong audio codec is to blame. By default, MIUI chooses SBC, the universal, but not the most stable codec. For Xiaomi headphones (for example, Redmi Buds 4), it is better to use AAC, and for third-party devices, aptX or LDAC.
How to change the codec:
- 🎧 Put your headphones on the phone.
- 📊 Open the Settings. → Connections → Bluetooth.
- 🔧 Put the badge on. ⚙️ near the connected device.
- 🎵 Choose an audio codec and try it one by one. AAC, aptX, LDAC.
AAC
aptX
LDAC
SBC
If your MIUI version does not have a manual codec selection, use the Developer Options app:
1. Enable Developer Mode (7 taps according to "Version MIUI").
2. Go to Settings → Additional → For developers.
3. Find the Bluetooth Audio Codec and select the one you want.⚠️ Attention: Codec LDAC It gives better sound quality, but increases latency to 200-300 ms. for games and videos, it is better to use aptX Low Latency.
5. Elimination of interference from other wireless devices
Bluetooth operates at 2.4 GHz, the same frequency as Wi-Fi, microwaves, wireless mice, and if you have a lot of devices around you, they cause interference that weakens the signal, especially in offices or apartment buildings.
How to reduce interference:
- 📶 Switch the router to the 5 GHz band (if it supports).
- 🔌 Disable unnecessary Bluetooth devices (fitness bracelets, keyboards).
- 📵 Keep your phone away from microwaves, wireless speakers.
- 🔄 B Settings → Wi-Fi enable Smart Switching (automatic selection of less loaded channel).
To check the load of the air, use the WiFi Analyzer (Android) application. If the 2.4 GHz channel is overloaded (more than 5 networks), try:
- 🔄 In the router, change the Wi-Fi channel from Auto to 1, 6 or 11 (least loaded).
- 📱 On the phone in Settings → Wi-Fi → ⋮ → Turn off Wi-Fi Direct additionally.
6. Network reset and antenna calibration
If Bluetooth started to "glutch" after updating or resetting the phone, the problem may be incorrect network settings. A full reset will return the settings to factory, but will remove all the stored devices.
How to perform the reset:
- Go to Settings → Connections and Sharing → Resetting.
- Select Network Reset (not to be confused with a full reset!).
- Confirm the action and restart the phone.
After reset, calibrate the antenna (relevant to Redmi Note 10/11/12):
1. Enable the Developer Mode.
2. Go to Settings → Additional → For developers.
3. Find "Bluetooth Calibration" and click "Reset Calibration".⚠️ Note: On some models (Redmi) 9T, Redmi 10C) Calibration may be reset after update MIUI. Repeat the procedure after each major update.
7 Radical methods: firmware and antenna replacement
If nothing works, hardware modifications remain, requiring technical skills and may be warranty-free, but they yield maximum results.
Method 1: Firmware of the custom core
Some custom cores (e.g. FrancoKernel or Kirisakura) optimize the operation of the Bluetooth module.
- Unlock the bootloader through the Mi Unlock Tool.
- Install custom recovery (TWRP or OrangeFox).
- Sweep the kernel through recovery (see instructions on XDA Developers for your model).
Method 2: Replace Bluetooth antennas
On the Redmi Note 8/9/10, the Bluetooth antenna often deviates from the board due to overheating. Symptoms: the signal disappears when the phone is tilted or heated. The solution is to solder the antenna or replace it with a more powerful one (for example, from Poco F3).
How to check if the antenna is in trouble
| Method | Difficulty | Range increase | Risks. |
|---|---|---|---|
| Core firmware | ⭐⭐⭐⭐ | 30% | Loss of warranty, brick |
| Replacement of antenna | ⭐⭐⭐⭐⭐ | 50% | Damage to the fees |
| External adapter | ⭐ | 100% | Inconvenience of use |