Connecting the modem to the Xiaomi router: full instruction with expert advice

External connection 3G/4G-Xiaomi router modem is a universal solution for cases when there is no wired Internet, and stable Wi-Fi is needed here and now, this scheme works in country houses, in dachas, on trips or even as a backup channel in case of disconnection of the main provider. However, not all Xiaomi routers support USB-modems are out of the box, and incorrect settings can lead to no connection or low speed.

In this guide, we’ll go through all the steps of connecting, from choosing compatible hardware to fine-tuning the firmware. You’ll learn which modems are guaranteed to work with the Mi Router 4A, 4C or AX3000, how to get around common bugs (like Error 67 or no network), and even how to get the router to automatically switch between wired and mobile Internet. And if you encounter a problem after updating the firmware, there’s a section at the end of this article with solutions for such cases.

1. Compatibility: What modems work with Xiaomi routers

Not everyone. USB-The modem is suitable for connecting to a Xiaomi router, because the manufacturer limits support to certified devices, and the list of compatible models depends on the firmware version. MT7621 (Like Mi Router. 4A Gigabit is better at working with modems on the Qualcomm platform, while budget models like Huawei E3372 You may need additional settings.

Here is the current list of verified modems (data for 2026):

• 🔹 Huawei E3372h — It's a generic version that works with most MiWiFi firmware without tambourine dancing. 4G LTE Cat.4 (150 Mbps).
• 🔹 ZTE MF823 — Budget modem with good compatibility, but may require manual indication APN.
• 🔹 TP-Link M7350 — Reliable choice for routers on MiWiFi R4CM, Supports external antennas.
• 🔹 MegaFon M150-2 — optimized for Russian networks, but may conflict with firmware older 3.0.27.
• 🔹 Yota Many – works only after resetting to factory settings (see section on errors).

⚠️ Note: Modems with built-in memory (e.g. Huawei) E5577 microSDs may not be defined by the router as a network device, in which case you will have to use a separate powered hub or turn off the drive in the modem settings.

2. Router preparation: firmware update and inclusion USB-modem

Before you connect the modem, make sure your Xiaomi router is ready to work with the device. USB-And that's what devices do:

1. Update your firmware to the latest version via Settings → General → Firmware Update. For Mi Router 4C models, the minimum supported version is 2.28.13, otherwise the modem simply won’t be recognized.
2. Activate support USB: Go to Settings. → Additionally. → USB-Settings. Turn on Modem Modem (3G/4G). If you don’t have this option, your router model doesn’t support modems (see the table below).

Connect the modem.

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⚠️ Note: Xiaomi AIoT Series routers (e.g, AX3600) They can block uncertified modems at the kernel level, in which case only an alternative firmware (like Padavan) will help, but this will void the warranty.

Update the firmware to the latest version|Enable modem modem in settings USB|Connect the modem via the extension cord (if necessary)|Check the compatibility of the modem model with the router-->

3. Connection setting: APN, PIN-code and network mode

Once the modem is physically connected, the router must automatically identify it and prompt the router to configure the Internet.

1. Check the indicators: The modem must be on a blue/green LED (network connection) and the router has a flashing yellow USB indicator (active device).
2. Indicate. APN manually: Go to Settings → Internet → USB-In the field. APN enter your operator’s details (see table below). If you need a login / password, check them with the provider (for example, for MegaFon this is often the case). gdata/gdata).
3. Set up Network Mode: From the modem menu, select 4G Only (LTE) if the router does not support automatic switching. Turn off IPv6 if there are connection errors.

Critical detail: if your modem requires input PIN-And the router doesn't ask for it, so it doesn't recognize it as a modem, and then only the firmware that supports it will help. USB_ModeSwitch (For example, OpenWRT).

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If the router does not see the modem, try connecting it to your computer and updating the modem firmware through the official software of the manufacturer (for example, Huawei HiLink or ZTE Connection Manager).

4. Typical errors and their solutions

Even if you set it up properly, you can have problems, and here are the most common mistakes and ways to fix them:

• 🚨 Error 67 (Registration failed): Reason: modem cannot register with the operator's network.Solution: Check balance SIM-cards (sometimes operators block access with zero count) Reboot the modem by pulling out and pasting back SIM-Reset the modem settings to factory settings via the web interface (192.168.8.1).
• 🚨 The modem is defined as a drive: Reason: the router sees the modem's built-in memory. Solution: Format the microSD (if any) or remove it. Connect the modem through USB-Power hub. Update the router's firmware to a support version USB_ModeSwitch.
• 🚨 Low speed (less than 10 Mbps): Reason: router limits USB-port or modem is operating 3G. Solution: In the modem settings, select Only LTE. Connect an external antenna (if the modem supports) and check the network load from the operator (for example, through the Speedtest application).

⚠️ Warning: If the router starts spontaneously restarting after connecting the modem, this is a sign of power shortage. Use the power supply on 2A (for example, from charging Xiaomi) 20W) instead of the standard 1A.

5. Automatic switching between wired and mobile Internet

One of the most useful features is a backup channel, so set up your router to automatically switch to the modem if the main Internet (such as PPPoE or DHCP) is lost.

1. Go to Settings → Internet.
2. In the Backup Connection section, select USB-modem.
3. Set a Ping Host (e.g. 8.8.8.8) and a checkout interval (60 seconds).
4. Save the settings and restart the router.

Now, when the main connection breaks, the router switches to the modem, and when it recovers, it returns back. USB-port.

🔹 Additional Life Hack: If you have a dual-band router (for example, AX3000), divide networks:

• Main Internet (wired) - distributed in the range of 5 GHz.
• Reserve (modem) - only 2.4 GHz.

This way, devices will not “jump” between networks when switching.

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Automatic switching only works when active. USB-If the modem is disabled, the router will not be able to use it as a backup channel, even if it is configured.

6. Alternative ways to connect (if USB does not work)

If your Xiaomi router does not support USB-modems, there are workarounds:

• 📶 Bridge mode (WISP): Connect the modem to another device (like a smartphone or a second router), and then set up Xiaomi as a repeater of its network. NAT, What can interfere with online games.
• 🔄 Reverse tetering: If you have a Xiaomi smartphone, connect the modem to it, then turn on Modem Modem and distribute Wi-Fi.
• 🖥️ PC proxy: Connect the modem to your computer, set up Internet sharing, and connect the router to your PC via Ethernet. AC2100.

⚠️ Note: When using bridge mode, speeds can drop by 30-50% due to dual routing. For stable operation, select a separate Wi-Fi channel (for example, 5 GHz for main traffic, 2.4 GHz for reserve).

7. Optimization of connection speed and stability

To make mobile Internet via modem work as quickly as possible:

• 📡 Modem positioning: Place the modemier to the window or on a hill. Avoid metal surfaces and other sources of interference.
• 🔌 Power: Use a ferrite ring extension cord to reduce interference. If the modem is warming, plug it in via an active hub.
• ⚙️ Settings MTU: In the router menu (Settings) → Internet → USB-modem MTU = 1472 (optimum for the 4G).
• 🔄 Load balancing: If you have two channels (wired) + Modem), configure the routing rules so that video and downloads go through the modem and the rest of the traffic goes through the main Internet.

Speed check: After setting up, test the connection via Speedtest, if the speed is below 50% of the declared operator, check:

• Signal level in modem settings (RSRP should be above -100 dBm).
• Loading base station (during peak hours, the speed may fall).
• QoS settings on the router (turn off traffic prioritization for the test).

FAQ: Answers to Frequent Questions