Why does the Huawei LTE7490 M904 connect to Wi-Fi but there is no internet? - A complete troubleshooting guide

You are facing a typical problem: router Huawei B715 LTE7490 M904 The router distributes Wi-Fi, devices connect to the network, but there's no internet. There's a signal, but pages won't open, messaging apps don't work, and videos won't load. This situation is familiar to many owners of this 4G router—especially after a firmware update, a SIM card change, or a thunderstorm. In 80% of cases, the problem can be resolved without calling a service center, but to do so, you need to accurately determine the source.

In this article, we will examine all possible reasons - from the banal (unpaid tariff) to technical (failure in the settings) APN or conflict IPv4/IPv6). You will receive diagnostic checklists, screenshots of the router menu, as well as instructions for resetting settings and manual configuration. We will pay special attention to the specifics of the model. M904, which differs from other modifications LTE7490 firmware and range support.

1. Checking basic parameters: tariff, SIM card and indicators

Before delving into your router settings, rule out external factors. Start with the simplest:

  • 💳 Has the tariff been paid? Operators (MTS, Beeline, Tele2, MegaFon) sometimes block access when your balance is zero, but the Wi-Fi network still works. Check your balance using a USSD command (for example, *100# for MTS) or personal account.
  • 📶 Is there a 4G signal? The indicator on the router body lights up 4G or LTE? If only one light is on 3G or E, the problem may be in the coverage area or the antenna.
  • 🔄 Rebooting the router. Turn it off LTE7490 M904 Unplug the power cord for 30 seconds, then plug it back in. In 30% of cases, this resolves temporary connection issues with the operator.
  • 📱 Does the internet work on your phone? Insert your SIM card into your smartphone and check your mobile data connection. If there's no connection there either, the problem is with your carrier.

If everything is in order with the tariff and coverage, but the indicator 4G If the light on the router is blinking or off, the SIM card may not be recognized. Try:

  1. Remove the SIM card, clean the contacts with an eraser (without going overboard!) and insert it back.
  2. Check if the router supports the format of your SIM card (it should be nano-SIM).
  3. Make sure the card is inserted into the slot. SIM1 (on M904 the second slot may be blocked by firmware).
⚠️ Attention: If you purchased a router from a carrier on credit or under a contract, it may be locked to a specific SIM card. Inserting a card from a different carrier will result in no internet service.
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2. Diagnostics via the router's web interface

If basic checks don't help, go to the control panel Huawei LTE7490 M904To do this:

  1. Connect to the router's Wi-Fi network (or use a LAN cable).
  2. Open your browser and enter the address 192.168.8.1 (or http://hi.link).
  3. Enter your login and password (default - admin / admin, if you haven't changed it).

In the router menu, go to the section Status and check:

Parameter What should be What to do if not
Network Status Connected or Registered If Disconnected — There's a problem with your SIM card or carrier. Try resetting your network settings.
Network Type LTE or 4G If 3G or 2G - Check your coverage area or range settings.
IP address Any address of the type 10.x.x.x, 100.x.x.x or public IP If 0.0.0.0 — Error obtaining IP address from the operator. You need to manually enter the APN.
DNS servers Addresses of the type 8.8.8.8 (Google) or operator servers If empty or 0.0.0.0 — enter DNS manually (see section 4).

If you see an error in the status 692 or 628 — These are operator authentication issues. This can be resolved by calling support and asking them to "re-register the device on the network."

☑️ Diagnostics via web interface

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3. APN Settings: Why the Router Won't Connect to the Internet

Incorrect parameters APN (Access Point Name) — one of the most common reasons for the lack of internet Huawei LTE7490 M904Operators frequently change these settings, and the router does not update them automatically.

To set up APN manually:

  1. Go to the router's web interface (192.168.8.1).
  2. Go to Settings → Mobile Network → APN Profile.
  3. Click Add and enter your operator's details:
  • 📡 For MTS: Profile Name - MTS, APN — internet.mts.ru, username and password - leave blank.
  • 📡 For Beeline: Profile Name - Beeline, APN — internet.beeline.ru, login/password - not required.
  • 📡 For MegaFon: Profile Name - Megafon, APN — internet, login/password are empty.
  • 📡 For Tele2: Profile Name - Tele2, APN — internet.tele2.ru, login/password - not needed.

After saving the profile, reboot the router. If the APN was already registered, but the internet isn't working, try:

  • Delete the old profile and create a new one.
  • Change the authentication type to PAP or CHAP (in APN settings).
  • Disable IPv6 in the mobile network settings (if enabled).
⚠️ Attention: On some firmware versions LTE7490 M904 After the update, the APN settings for the second SIM slot are reset. If you are using a backup card, check its profile separately.
How can I find out the current APN settings for my operator?

Call your carrier's support team and ask them to send you an SMS with the APN settings. Or find the official page with the settings (for example, for MTS, it's mts.ru/pomosh/pomosh_po_nastroyke_interneta).

4. DNS issues: why websites don't open even when the connection is working

Sometimes the router connects to the Internet (indicator 4G It's on, the IP address is there), but pages in the browser don't open, and messengers don't load messages. The culprit is broken DNS serversIt's like the internet's phone directory: if DNS doesn't respond, websites become unavailable even though there's a connection.

To check and fix:

  1. In the router's web interface, go to Settings → DNS.
  2. In the field Primary DNS enter 8.8.8.8 (Google), in Secondary DNS — 1.1.1.1 (Cloudflare).
  3. Save the settings and reboot the router.

If the internet works after this, the problem was with your operator's DNS. To confirm that DNS is the culprit, you can temporarily ping the website via the command line:

ping 8.8.8.8

If you have a ping but the websites don't open, it's 100% DNS's fault.

5. Resetting the router and flashing it

If none of the previous methods helped, it’s time for radical measures - reset to factory settings or firmware updatesOn . Huawei LTE7490 M904 it's done like this:

Hard reset:

  1. Press and hold the button RESET on the back panel of the router (10-15 seconds) until the indicators blink.
  2. After rebooting, the router will return to factory settings (login/password - admin/admin).
  3. Please set up your connection again (APN, Wi-Fi, password).

Firmware update:

  1. Download the latest firmware for B715 LTE7490 M904 from the official Huawei website (support section).
  2. In the router's web interface, go to Settings → System Update.
  3. Download the firmware file and wait for the process to complete (do not turn off the router!).
⚠️ Attention: On models M904 with firmware version 11.118.99.00.00 and below, a bug may occur with network loss after a reset. If the internet still doesn't work after the reset, update the firmware manually.

Critical feature LTE7490 M904After updating the firmware to version 21.3xx.xx.xx, some operators (for example, Tele2) require device activation in your personal account. Without this, the internet won't work, even with the correct APN.

6. Virus scanning and MAC address blocking

It is rare, but it happens that the router is infected with malware (for example, through a vulnerability in the web interface) or its The MAC address is blocked by the operator.Signs:

  • The router constantly reboots.
  • In the logs (System Log) unknown connections appear.
  • The Internet only works on some devices.

To check:

  1. Go to Settings → Security and look at the list of connected devices. If you see any unfamiliar ones, change the Wi-Fi password.
  2. Check the MAC address of the router (on the sticker at the bottom or in Status → Device Information). Call the operator and check if it is blocked.
  3. If you suspect a virus, reset your router to factory settings and update the firmware.

To change the MAC address (if it is blocked):

  1. In the web interface, go to Settings → Mobile Network → Advanced.
  2. Find the field MAC Address and enter a new address (can be generated online).
  3. Save and reboot the router.

7. Alternative connection methods: USB tethering and bridging

If the router stubbornly refuses to distribute the Internet via Wi-Fi, but the 4G connection works (checked via Status), try alternative options:

  • 🔌 USB connection (tethering): Connect the router to the computer with a cable. In the router settings, enable USB Tethering (in the section Dial-Up). The computer will receive Internet access via the network.
  • 🌉 Bridge Mode: If you have a second router, connect it LTE7490 M904 Connect it to a cable and set up bridge mode. This will help avoid Wi-Fi issues on the main device.
  • 📶 External antenna: If the 4G signal is weak (1-2 bars), connect an external antenna to the connectors TS9 on the router. This may solve the problem with connection drops.

To configure the bridge:

  1. In the web interface LTE7490 go to Settings → Network Settings.
  2. Turn on Bridge Mode and save the settings.
  3. Connect the router to the main device via the port LAN.

Frequently Asked Questions (FAQ)

🔍 Why didn't I get internet after resetting my settings?

A reset deletes all user settings, including the APN. After the reset, you'll need to reconfigure the APN profile for your carrier (see Section 3). Also, check if the device requires activation in your carrier's account (applies to firmware versions 21.3xx.xx.xx and later).

📵 My router isn't picking up 4G, only 3G. What should I do?

Check:

  1. Your operator's coverage area (4G may be disabled in your area).
  2. Range settings: in the web interface, go to Settings → Mobile Network → Network Mode and select 4G Only.
  3. Firmware update: Older versions may not support new 4G bands.
🔒 How to protect your router from hacking?

Update the firmware to the latest version, change the default password admin to complex (at least 12 characters), disable remote access (Remote Management) in the settings and enable MAC address filtering for Wi-Fi.

🔄 Can I use a router with a SIM card from a different operator?

If the router isn't locked to a specific carrier, yes. However, manual APN configuration may be required. Check with the seller or Huawei support to see if your router is unlocked. LTE7490 M904.

📡 Why is my internet speed slow even though I have a full 4G signal?

Reasons:

  • Overload of the operator's base station (especially in the evening).
  • Speed ​​limit according to tariff (check in your personal account).
  • The power saving mode is active on the router (disable it in the settings).
  • The operator's DNS is used - try changing it to Google (8.8.8.8).

📖 Read also

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