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Im connected to a 5g connection but my pc only produces VHT 2.4g, please help

ChickMagneTzy 20 Reputation points
2025-08-20T09:24:52.7633333+00:00

After a Windows update. My wireless adapter was only producing VHT 2.4g connection, it seems that my wireless adapter hardware is doing well because I was connected to 5g. but my computer internet speed is quite slow. I tried uninstalling, reinstalling, and update the drivers, network reset, ips configs, dns flushes, winsock resets, but nothing could really help me. I tried to revert back to my older windows update and roll back drivers too. What should I do? please help me. I really need to boost my internet speed because I need it in my work, thanks

Windows for home | Other | Internet and connectivity
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  1. Adrian_A_ 4,475 Reputation points Independent Advisor
    2025-08-21T09:25:06.51+00:00

    Got it, thanks for confirming. This is likely a driver and compatibility conflict, not your router or hardware.

    Here’s what I suggest you can do now.

    Step 1. In Device Manager, uninstall the Realtek 8811CU and check the box for Delete driver software.

    Reboot.

    Download and install the latest driver directly from your adapter manufacturer or Realtek’s official site. Avoid relying on Windows Update.

    Step 2. Try an older stable driver

    If the latest still locks you on VHT 2.4, install an older driver version.

    After installing the stable version, use Microsoft’s Show or Hide Updates tool to block Windows from forcing the newer driver back in:

    https://download.microsoft.com/download/f/2/2/f22d5fdb-59cd-4275-8c95-1be17bf70b21/wushowhide.diagcab

    Step 3. Even if you don’t see a Preferred Band setting, check the “Wireless Mode” property under Advanced. If it only lists 802.11b/g/n, the driver is the problem. It must show 802.11ac for 5 GHz.

    Step 4. Plug the adapter into a USB 3.0 port (blue slot) instead of USB 2.0. Some Realtek sticks fall back to 2.4 GHz if plugged into 2.0.

    Move it away from other USB devices that might cause interference.

    Let me know if the issue still persists after these steps.

    Best of luck.

    1 person found this answer helpful.

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  1. Adrian_A_ 4,475 Reputation points Independent Advisor
    2025-08-20T10:55:43.4733333+00:00

    Thanks for bringing this up. I am here to help.

    A few quick questions to narrow it down:

    1. What is the exact model of your wireless adapter? Is it Intel, Realtek, Qualcomm, etc.?
    2. In Device Manager > Network adapters > your Wi-Fi card > Properties > Advanced tab, do you see an option for Preferred Band, Wireless Mode, or 802.11n/ac/ax mode?
    3. Do you see your router’s 5 GHz SSID at all, or only the 2.4 GHz one?
    4. Has anyone else on the same Wi-Fi network like a phone or laptop, been able to connect to the 5 GHz normally?
    5. Did the rollback to the previous Windows version temporarily fix it, or did the issue stay the same?

    While waiting for your answers, here are the basic steps you should try right now

    Step 1. Run Windows Network Troubleshooter

    Settings > Update & Security > Troubleshoot > Additional troubleshooters > Internet Connections.

    Step 2. Press Windows + R, type devmgmt.msc, press Enter.

    Right-click your Wi-Fi adapter > Properties.

    Go to the Advanced tab.

    Look for Preferred Band or similar > set it to Prefer 5 GHz.

    Look for Wireless Mode > make sure it’s set to include 802.11ac or 802.11ax and not just b/g/n.

    Step 3. Check router settings

    Log in to your router.

    Make sure 5 GHz Wi-Fi is enabled.

    Set different SSID names for 2.4 GHz and 5 GHz so you can choose manually.

    Step 4. Remove and reinstall with the manufacturer’s driver

    Uninstall the Wi-Fi adapter from Device Manager and check “Delete driver software for this device”.

    Reboot.

    Download the latest driver directly from the manufacturer’s site like Intel/Realtek/Qualcomm, instead of using Windows Update.

    Install it manually.

    Step 5. In Device Manager > Wi-Fi adapter > Properties > Power Management tab, uncheck Allow the computer to turn off this device to save power.

    Also, go to Control Panel > Power Options > Advanced settings > Wireless Adapter Settings, set it to Maximum Performance.

    If nothing works, it may be a Windows Update compatibility bug with your adapter model. If so, the workaround is to install a known stable driver version or an older Intel or Realtek driver, for example, and block Windows from auto-updating it.

    You can also use the “Show or Hide Updates” troubleshooter tool from Microsoft to prevent Windows from forcing the broken driver back in.

    Let me know the answers to the questions above and how these steps go.

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