In the Age of Wi-Fi and Mobile Internet USB-Modems may seem like a relic of the past, but they are still relevant in areas with poor coverage. 4G, When traveling out of town or when you need to distribute the Internet to multiple devices without a router. - Xiaomi Redmi Note 8, despite support OTG, It doesn't always recognize correctly. USB-Out of the box modems, especially if you're talking about modems from MTS, Beeline, MegaFon or Yota, in this article we'll look at all the nuances: from choosing a compatible modem to manually configuring APN and solve common errors such as "Device not recognized" or "No network access".
The main problem is that Android 9/10/11 (depending on the version MIUI on your Redmi Note 8) By default, the connection is blocked USB-modems as "uncertified" USB-It's done for security, but it's a bit of a problem for users, and fortunately, you can get around the restriction without root rights, so you just turn on Developer Mode and you activate a couple of hidden settings. 5 minutes, even if you have never worked with OTG or USB-device.
1. Compatibility check: which modem is suitable for the Redmi Note 8
Not all. USB-modems are equally useful. Redmi Note 8 supports connectivity via USB OTG, but there are nuances:
- 🔹 Compatible models: modems based on Qualcomm chips MDM9207/MDM9607 (for example, Huawei E3372, ZTE MF823) Or HiSilicon, or Beeline modems, avoid outdated modems on the Option Globetrotter, which are often unrecognized.
- 🔌 Type of connection: modem must support USB 2.0 (USB 3.0 may not work due to limitations OTG-adapter).
- 📶 Frequency: optimal modems with support for Russia LTE Band 3 (1800 MHz), Band 7 (2600 MHz) and Band 20 (800 MHz).
- 💾 Firmware: Some modems require firmware upgrades to the latest version (e.g. Huawei) E8372 s MIUI 12+ can glitch without an update).
If you haven’t bought a modem yet, look for models with built-in MiFi support (such as the TP-Link M7350), which allow you to connect via both USB and Wi-Fi, which is convenient for a backup channel. Before buying, check the reviews at 4PDA or MIUI Forum, where specific models are often discussed compatibility with Xiaomi.
⚠️ Note: Modems from telecom operators (e.g. MTS) 827F Beeline E1550) frequently blocked under SIM-If you plan to use a modem from another operator SIM, Make sure it is unlocked (you can check it through DC-Unlocker).
2. Preparation of the smartphone: turn on OTG and the developer mode
Redmi Note 8 is recognized by the USB-Modem, two key functions need to be activated:
- Turn on USB OTG: Go to Settings → Connection and Sharing → USB OTG and move the slider to the right. If you don't have one, upgrade MIUI to the latest version (relevant for firmware older than MIUI 11).
- Activate Developer Mode: Go to Settings → About Phone and 7 times click on the MIUI Version. After that, the Settings menu → Additional item For Developers will appear.
In the menu for developers, find and turn on:
- 🔧 Debugging by USB (necessarily!)
- 🔄 Choosing a configuration USB → File transfer (MTP) or USB-modem (RNDIS)
- 🛡️ Disable rights check USB (if)
Turn on USB OTG|Activate the Developer Mode|Enable debugging on USB|Select configuration USB"RNDIS"|Disable rights check USB (if available)-->
After these manipulations, connect the modem through OTG-Adapter (required to be original or certified) If the modem flashes but the internet doesn't appear, move on to the next step.
Installation of drivers: why the modem is not defined
A common problem is that the smartphone sees the modem as an "unknown device," which means that there are no drivers in the system.
- Automatic installation: Connect the modem to the Redmi Note 8 and wait for the "Install driver" notification. If the process is stalled, restart the phone and reconnect.
- Manual installation: Download drivers for your modem from the manufacturer’s official website (e.g. Huawei – huawei.com). Transfer the.apk or.inf file to your phone and install it through the File Manager.
- Use of Universal Drivers: If the manufacturer does not provide a driver for Android, try universal solutions like USB Serial Drivers (available on Google Play).
| modem | Required driver | Download link |
|---|---|---|
| Huawei E3372 | HiLink | Official website |
| ZTE MF823 | ZTE USB Driver | ZTE Support |
| MTS 827F | Qualcomm QMI | 4PDA (Modem section) |
| Yota Many | RNDIS | Support for Yota |
⚠️ Warning: If the modem is still undetectable after installing the drivers, check if the antivirus (e.g. Avast or 360 Security) is blocking it. Add the modem to exceptions or temporarily disable protection.
Huawei|ZTE|MTS/Beeline/MegaFon|Yota|Other |I don't know-->
4. APN setup: without this, the Internet will not work
Even if the modem is recognized, without the correct APN (Access Point Name) settings, the Internet will not work.
- Go to Settings. → SIM-maps and mobile networks → Access points (APN).
- Click Add Access Point and fill in the fields according to your operator’s data:
| Operator. | APN name | APN | Type of authentication |
|---|---|---|---|
| MTS | mts | internet.mts.ru | PAP |
| Beeline | beeline | internet.beeline.ru | None |
| MegaFon | megafon | internet | PAP |
| Yota | yota | lte.internet.yota | None |
After saving the settings, restart your phone. If the Internet is not available, check:
- 📵 Is it inserted correctly? SIM-map to modem (network indicator should be green).
- 🔄 Is Data Mode enabled in the modem settings (if there is a web interface).
- 🔒 Is there any traffic restriction on the operator (e.g. lockdown) USB-modem-rate).
💡
If the Internet is running after setting up the APN but the speed is low, try manually selecting a 4G network (LTE) in the modem settings. Connect the modem to your PC, go to its web interface (usually 192.168.8.1) and select LTE Only under "Network".
5. Solving typical errors
Even if you set it up properly, you can have problems.
Error: "USB device not recognized"
Causes and solutions:
- 🔌 The problem is OTG-Adapter: Try another adapter or connect the modem through the USB-feed-in.
- 🔄 Conflict with others USB-Devices: Disable all other devices USB-gadgets (flash drives, keyboards).
- 📱 Failure MIUI: Reset network settings in Settings → System system → Resetting settings → Resetting network settings.
Error: "No access to the network"
What to do:
- 📡 Check the coverage of the network: you may be out of range LTE. Switch modem to mode 3G Only.
- 🔐 Make sure that there are enough funds in the account and the "Turbo button" is not activated (for some operators).
- 🔧 Update your modem firmware through official software (e.g. Huawei HiLink for Huawei modems).
Error: “Modem connects, but the Internet appears, then disappears”
Possible causes:
- 🔋 Lack of power: connect the modem via an externally powered hub or use a Y cable OTG supplementary.
- 📶 Base Station Overload: Try Connecting at Other Times of the Day.
- 🛠️ Failure in MIUI: Clear the cache of system applications (Settings) → Annexes → Application management → Three points. → Show system-based → Telephone services → Clear the cache).
What to do if the modem is warmed and switched off?
6. Alternative ways of connecting
If USB-The modem never worked, consider alternatives:
📶 Wi-Fi router USB-port
Some routers (e.g. TP-Link) TL-MR3020 or Keenetic support the connection USB-modem and Wi-Fi Internet distribution. This is convenient if you need to connect multiple devices.
📱 Modem mode on another smartphone
If you have a second USB-ethernet-enabled phone (like a Samsung Galaxy or Google Pixel), plug in a USB modem and activate Modem Modem Modem. Then connect the Redmi Note 8 to that phone via Wi-Fi or Bluetooth.
🖥️ Connection via PC
You can connect the modem to your computer, enable Shared Internet access in Windows/macOS, and then distribute Wi-Fi from your PC on the Redmi Note 8.
💡
If USB-The modem doesn’t work on the Redmi Note 8, but it works well on the PC, the problem is almost always in the drivers or settings. MIUI. Start by updating your phone’s firmware and resetting network settings.
7. Optimization of connection speed and stability
USB-Modems often suffer from unstable speeds to improve connectivity:
- 📍 Positioning: Place the modemko to a window or on a hill – this improves signal reception.
- 🔄 Manual network selection: in the modem settings (web interface) select LTE Only Auto instead of Auto.
- 🛡️ Shutdown VPN: if you use VPN (For example, 1.1.1.1), disable it - it may conflict with the modem.
- 📊 Traffic monitoring: Use NetGuard or GlassWire to track which apps are consuming the internet.
To check the real speed, use Speedtest by Ookla or nPerf. If the speed is below 10 Mbps with a good signal, try:
- Change the DNS to 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare) in the APN settings.
- Disable IPv6 in modem settings (if supported).
- Update the modem firmware to the latest version.
8.Security: How to Protect Your Connection
USB-Modems are vulnerable to attacks, especially if used in public places:
- 🔐 Traffic Encryption: Always Use VPN (For example, ProtonVPN or Windscribe when connecting to important services (banks, mail).
- 🛡️ Firewall: Install NetGuard or AFWall+, to block suspicious connections.
- 🔄 Updates: Check modem firmware updates regularly and MIUI — They often close vulnerabilities.
- 🚫 Disable Auto Connection: In Android settings, turn off Automatic Open Network Connection (Settings) → Wi-Fi → Additionally).
Important: Some USB-Modems (especially from Chinese manufacturers) contain vulnerabilities that allow attackers to access your phone through a phone. USB-To minimize risk, never connect the modem to a public port. USB-hubs (such as airports or cafes) and use only trusted OTG-adapter.