Xiaomi Redmi 9A how USB-PC modem: A complete guide to setup and error elimination

Modern Xiaomi smartphones are capable not only of calls and instant messengers - they can replace a full-fledged router if there is no Wi-Fi at hand. 9A, Despite the budget, it supports the function. USB-It's a modem, allowing you to distribute mobile Internet to your computer via cable, and this is especially true for laptop owners without any data. SIM-Cards or with unstable Wi-Fi.

However, the setting has nuances: from choosing the right one USB-In this article, we will analyze all the stages of connection, compare the speed USB-Wi-Fi modem, and tips on traffic optimization, if you encounter an unidentified device error or the modem is not activated, you will find proven solutions here.

Why use it USB-modem instead of Wi-Fi?

Many Redmi 9A users mistakenly believe that USB Internet sharing is no different than Wi-Fi, and it actually has key advantages:

• 🔋 Less battery consumption – when connected via cable, the phone charges from the PC rather than wasting energy on the signal.
• 📶 Stable signal – no interference typical of Wi-Fi (walls, other devices).
• 🔒 Security – the connection cannot be intercepted, unlike open Wi-Fi networks.
• ⚡ Higher speed — USB 2.0 (in Redmi) 9A) Provides up to 480 Mbps, while Wi-Fi on this model is limited to 2.4 GHz.

But there are also downsides: cable binding (you can't leave your computer) and possible driver problems on older versions of Windows, so if you need to connect multiple devices, you'd better use Access Point Mode.

Requirements for Redmi connection 9A how USB-modem

Before setting up, make sure that all the conditions are met:

Use the original. USB-cable (or certified cable)

Make sure your phone is on mobile internet (3G/4G)

On the PC installed current drivers for Xiaomi

Disable VPN and proxy on both devices

Battery charge of the phone at least 20%

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Pay particular attention to cable: cheap, uncertified wires may not support data transfer, only charging, and if you connect to Windows Device Manager and you have an Unidentified Device, the problem is the cable or the port.

⚠️ Attention: On Redmi 9A firmware MIUI 12.0.5 may not be available below USB-Modem, update the software through Settings → The phone. → Updating the system.

Step-by-step instruction: how to turn on USB-modem 9A

The process of activating the modem mode takes no more than 2 minutes:

1. Get Redmi on board. 9A computer-to-computer USB-In the phone notification menu, select File Transfer mode (MTP) (It's temporary, we'll change it later).
2. Open the Settings. → Access Point and modem.
3. Activate the switch. USB-If the option is inactive, check if the mobile Internet is on.
4. A new network connection will be available on the PC, and in Windows it will be called Ethernet or USB Network Connection.

Important: On some versions MIUI option USB-The modem is hidden. To unlock it, go to Settings. → Additionally. → Special facilities → Developer Mode and Activate Debugging by USB.

Setting up a computer to work with USB-modem

After activating the mode on the phone, you need to configure the PC:

For Windows 10/11:

• 🖥️ Open the control panel. → Network connections.
• 🔄 Find a new connection (usually Ethernet) and check the status: there must be a network without access to the Internet (this is normal in the first stage).
• 🔧 If there is no connection, update the drivers through Device Manager → Network adapters.

For macOS/Linux:

These OSes usually don't require any additional action, and the system automatically recognizes Redmi 9A as a network adapter.

• 🍎 On Mac: Check System Settings → Network.
• 🐧 On Linux: run in the Sudo dhclient terminal -v

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If the Internet speed is through USB-Modem below expected, disable background updates Windows/macOS Close programs that consume traffic (such as Steam or uTorrent).

Speed comparison: USB-Wi-Fi modem vs. Wi-Fi on Redmi 9A

We tested both methods of distributing the Internet on Redmi 9A with a 4G tariff (MTS operator).

As you can see from the table, USB-The modem wins in all respects except convenience, which is due to the features of the MediaTek Helio chipset. G25 redmi 9A, which is optimized for wired connections.

Common Problems and Their Solutions

Even with the right setup, Redmi 9A users are likely to experience errors.

1.The computer cannot see. USB-modem

Reasons:

• 🔌 Faulty cable or port USB.
• 🖥️ There are no Xiaomi drivers (relevant to Windows) 7/8).
• 📱 No phone debugging on the phone. USB.

Solution: Try another cable, update drivers through the official Xiaomi website, enable debugging in Settings → About Phone → MIUI version (click 7 times).

2. the Internet is connected but not working

This is most often due to the APN settings.

1. Go to Settings. → SIM-maps and mobile networks → Access points (APN).
2. Select your operator's APN (for example, for Beeline it is Internet.beeline.ru).
3. Save the changes and restart the phone.

⚠️ Note: Some operators (e.g. Tele2) block the distribution of the Internet at certain rates.

3. Low speed or breakage of connection

If the speed is below 10 Mbit/s:

• 📡 Check the signal level. 4G on the phone (in the status line).
• 🔄 Switch to another. USB-port (preferably 3.0, it is blue).
• 🛠️ Turn off traffic savings in Settings → Battery → Saving traffic.

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If the problem persists, try resetting the network settings on your phone: Settings → System → Reset → Network settings reset.

Optimizing traffic when using USB-modem

Mobile internet is often limited, so it is important to monitor your usage.

• 📊 Use traffic monitoring apps like GlassWire or NetGuard.
• 🚫 Turn off automatic updates Windows/macOS applications.
• 🎮 Limit background downloads to Steam, Epic Games and other launchers.
• 📥 Set your browser to compress traffic (in Chrome: Settings) → Saving traffic).

The Redmi 9A also includes data saving:

1. Go to Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-map → Saving traffic.
3. Activate the option and add apps to exceptions (e.g. messengers).

FAQ: Frequent questions on USB-modem 9A