Huawei B621L as a WiFi Adapter: A Complete Guide to Connecting to PCs and Routers

Model Huawei B621L-26d (or simply GS B621L) is most often used as a 4G router for distributing mobile internet. But few people know that this device can be turned into a powerful WiFi adapter for a computer or even in bridge between two networks. This solution is useful if your PC doesn't have WiFi and a wired connection is unavailable, or when you need to boost the signal from your main router over 4G networks.

In this article - Unique connection schemes for the B621L in client mode (STA), which are not described in official Huawei documentationWe will look at three scenarios: connecting to a PC via USB/ETH, setting up as a repeater for another router, and using it in standby mode. WiFi Client to receive a signal from another network. All instructions have been tested on firmware V100R001C10B133 and newer.

Before you begin, check: your B621L must support the regime WiFi Client (This functionality is disabled in some firmware versions from operators.) If there is no option in the web interface WiFi Settings → Client Mode, an alternative method will be required through Telnet or flashing custom software.

1. Preparing the device: what needs to be done before setup

Before configuring B621L In adapter mode, follow the basic steps:

• 🔌 Connect the power - use the original power supply 12V/1ACheap analogues may cause failures under high load.
• 📡 Update the firmware - come in Settings → System → Software UpdateThe update will fix bugs with client mode.
• 🔄 Reset settings - press the button Reset for 10 seconds if the router has already been used. This will clear old configurations.
• 🖥️ Connect to the web interface — default address 192.168.8.1, login/password — admin/admin (or see sticker on the bottom).

If you are planning to use B621L As a PC adapter, ensure that other network connections (Ethernet, WiFi) are disabled on your computer to avoid routing conflicts. For Windows 10/11 laptops, you may need to disable the service. Autoconfiguration Wired Access through services.msc.

⚠️ Attention: In firmware from some operators (for example, Megafon or Beeline) the mode WiFi Client blocked. If there is no corresponding option in the menu, try flashing the international version of the software or use the workaround via Bridge mode (described in section 4).

2. Connecting the B621L to a computer via USB (modem mode)

The easiest way to use B621L As an adapter, connect it to your PC via a USB port. In this case, the router will function as 4G modem, distributing the Internet via cable or WiFi.

Instructions:

1. Connect B621L with a computer via a USB cable (included).
2. Wait for the drivers to install. If Windows doesn't recognize the device, download the driver. Huawei Mobile Partner from the official website.
3. In the router's web interface (192.168.8.1) go to Settings → Operating mode → USB modem.
4. Activate the option Allow internet access via USB and save the settings.

After this, your PC will receive the Internet via B621L as with a regular 4G modem. The speed will be limited by the capabilities of USB 2.0 (up to 300 Mbps), but this is enough for most tasks.

⚠️ Attention: When connected via USB router B621L will not be able to simultaneously distribute Wi-Fi. If wireless access is required, use the Ethernet port (Section 3) or configure bridge mode (Section 4).

3. Connect via Ethernet (LAN port) for a stable connection

If USB is not suitable due to speed limitations or a more stable connection is needed, connect B621L to PC via Ethernet cableThis method also allows you to use the router as an adapter for devices without WiFi (such as Smart TVs or game consoles).

Step-by-step setup:

1. Connect B621L with a computer patch cord (included) through the port LAN1.
2. In the router's web interface, go to Settings → Network → LAN.
3. Install IP mode in meaning Dynamic IP (DHCP).
4. In the section DHCP server Activate the option and save the settings.

Your PC should now automatically receive an IP address from B621LIf the Internet doesn't appear, check:

• 🔍 Network adapter settings on your PC (must be Obtain an IP automatically).
• 🔌 Cable - try a different port LAN or cable.
• 📡 4G signal - check the signal strength in the web interface (tab Status → Network).

4. Setting up the B621L in WiFi Client mode (receiving a signal from another router)

If you need to B621L received WiFi from another router and distribute it further (for example, via Ethernet or your WiFi network), configure the mode WiFi ClientThis is useful for:

• 📶 Signal amplification in a remote room.
• 🖥️ Connecting a PC without a WiFi adapter to a wireless network.
• 🔄 Organization of a backup channel (if the main router is disconnected, B621L will automatically switch to 4G).

Instructions:

1. In the web interface B621L go to Settings → WiFi → Client Mode.
2. Activate the option Enable client mode.
3. From the list of available networks, select the target WiFi network and enter the password.
4. In the section LAN settings install IP address router outside the range of the main network (for example, if the main router distributes 192.168.1.x, ask B621L address 192.168.2.1).
5. Save the settings and reboot your device.

After reboot B621L connect to the selected WiFi network and distribute its Internet through its ports LAN and your own WiFi network (if enabled).

What should I do if my firmware doesn't have a WiFi Client mode?

If your software version does not have the "Client Mode" option, try:

1. Update the firmware to the latest international version (download from the Huawei website).

2. Use Bridge mode: in the section Settings → Network → Bridge Add a WiFi interface and specify the target network.

3. Connect via Telnet and manually edit the config (requires CLI skills).

⚠️ Attention: In mode WiFi Client B621L It won't be able to broadcast its own WiFi network and receive someone else's at the same time. To enable both networks to work in parallel, configuration will be required. VLAN or flashing alternative software (for example, OpenWRT).

5. Using the B621L as a repeater (WiFi signal booster)

If the main task is - boost WiFi signal in a remote area, configure B621L as a repeater. This mode is different from WiFi Client the fact that the router will be repeat the original network with the same name (SSID), rather than creating a new one.

To configure:

1. Connect to B621L via cable or WiFi.
2. Go to Settings → WiFi → Repeater (WDS).
3. Turn on the mode WDS and select the target network from the list.
4. Enter the password for the main network and save the settings.
5. In the section WiFi settings install the same SSID and the password is the same as the main router.

After applying the settings B621L will broadcast a boosted signal from the main network. Devices will automatically switch between routers depending on the signal strength.

6. Alternative methods: Telnet and OpenWRT firmware

If standard methods do not work (for example, the operator has blocked the functionality), you can use advanced settings through Telnet or flash alternative software.

To connect via Telnet:

1. Activate Telnet via the web interface: go to the address http://192.168.8.1/html/telnet.asp and enable access.
2. Connect via command line:

   telnet 192.168.8.1
   login: admin
   password: admin

3. Run the commands to configure client mode:

   at^wancfg=2,1,1,"WiFi_Client"
   at^wanadd=1,2,"SSID_of_target_network","password"

For firmware OpenWRT:

• 🔧 Download firmware for Huawei B621L With official OpenWRT repository.
• 📥 Download it via the web interface in the section Software update.
• ⚙️ After flashing the firmware, configure the network via LuCI or SSH.

⚠️ Attention: Flashing third-party software will void your warranty and may brick your device. Before doing so, back up your current firmware using FTP (instructions are available on the 4PDA forums).

7. Common problems and their solutions

When setting up B621L As an adapter, users encounter common errors. Here's how to fix them:

If B621L If the settings don't save after a reboot, reset it to factory defaults and try the configuration again. In rare cases, disabling the feature helps. Automatic firmware update in the section System.

FAQ: Answers to frequently asked questions

Can the B621L be used as a WiFi adapter for Smart TV?

Yes, but only via the Ethernet port. Connect B621L to the TV with a cable, and set up the router itself in mode WiFi Client (section 4) or as a repeater (section 5). WiFi directly from the TV will not work, since B621L does not support the mode SoftAP for external devices.

How do I reset my password if I forgot my web interface login details?

Click the button Reset on the back of the router and hold it for 10-15 seconds until the indicators flash. After the reset, the login/password will become admin/adminIf the button doesn't work, use the utility Huawei Router Unlocker (USB connection required).

Why doesn't B621L pick up 4G even though the SIM card is active?

Check:

• 📶 Signal level in the web interface (Status → Network). If less -90 dBm, try an external antenna.
• 📱 Support for your operator's frequencies. B621L works on ranges FDD-LTE 800/900/1800/2100/2600 MHz.
• 🔄 Network mode: select in settings LTE only, if 3G interferes with a stable connection.

Is it possible to connect B621L to another router via WAN port?

Yes, but only in mode BridgeTo do this:

1. Connect B621L to the main router via port WAN (blue connector).
2. In the web interface B621L go to Settings → Network → Operating mode and select Bridge.
3. Please provide PPPoE details (if required) or leave them blank Dynamic IP.

In this case B621L will act as a transparent bridge, transmitting traffic between networks.

How to check that B621L is actually working in client mode?

Go to the web interface and check:

• 📡 In the section Status → WiFi A connection to the target network should be displayed.
• 🌐 In Status → Network field WAN IP must contain the address issued by the main router (for example, 192.168.1.100).
• 🔌 In Network connections Windows should now have a new adapter with internet access.