so, i am using the MediaTek Wi-Fi MT7921 wireless LAN card, and it keeps disconnecting and refusing to work.

Question

So, i need some help with my Wi-Fi adapter. my MediaTek Wi-Fi MT7921 wireless LAN card keeps disconnecting and then not showing up on my device manager, when i open network and internet settings to see what's wrong, the Wi-Fi setting is quite literally not there. Theres ethernet and Hamachi. but i cant see Wi-Fi option.

As you know, this is what the Wi-Fi option normally looks like, but for me it keeps disconnecting and then disappearing so i cant fix it. device manager as i said, also shows that my MediaTek Wi-Fi MT7921 wireless LAN card literally doesn't exist, which is also preventing me from fixing it, if you have any ideas, please tell me, im trying to do anything to fix this issue, i have been dealing with it for months.

ALSO. when i shut down my computer, and boot it up again, sometimes the connection works again, allowing me to use it, but this only lasts around 5 minutes, but i tried to do these following fixes.

resetting the network IP and socket.
deleting and reinstalling the MediaTek Wi-Fi MT7921 wireless LAN card.
Windows network reset.
checking if my computer is turning the device off to save power.
putting the wireless adapter settings power saving mode to maximum performance.
Opening command prompt and performing the command "sfc /scannow".

every single one of these fixes i have tried, yet not a single one has ever worked.

Answer 1

Hello, LucasTheGamer

Welcome to the Microsoft Community.

It sounds like you're experiencing issues with your MediaTek MT7921 wireless LAN card disconnecting and disappearing.

First of all, thank you for sharing some information, it seems that you have tried many steps, and I will continue to provide you with further suggestions to troubleshoot whether it is a system problem or a hardware problem:

1. Update the driver

Download the latest drivers:

Visit the MediaTek website or the website of your laptop or motherboard manufacturer (e.g., Dell, HP) to find the latest drivers for the MT7921.

If you can't connect to Wi-Fi at all, you can use another computer to download the driver and transfer it via USB.

Manually install the driver:

Right-click the Start button and select Device Manager.

Find any entry under the network adapter.

Right-click on your Wi-Fi adapter (if it appears) and select Update Driver.

Select Browse My Computer to find drivers, then navigate to the location where you downloaded the latest driver.

2. Change the network adapter Settings

Disable power saving mode:

Expand the network adapter in the Device Manager.

Right-click the MediaTek Wi-Fi adapter and select Properties.

Go to the Power Management TAB.

Uncheck allows the computer to turn off this device to save power. You seem to have tried and can skip.

Adjust advanced Settings:

In the same properties window, go to the Advanced TAB.

Look for Settings like roam sensitivity or wireless mode, and try adjusting those Settings.

3. Configure BIOS/UEFI

Check wireless Settings:

Restart your computer and go to BIOS/UEFI Settings (usually press F2, Del, or Esc at boot).

Look for options related to wireless networks to make sure Wi-Fi is enabled.

4. Windows Troubleshooting program

Go to Settings > Updates & Security > Troubleshooting > Other Troubleshooting.

Select the network adapter and run the Wi-Fi troubleshooter.

5. Use a USB Wi-Fi adapter

If the internal Wi-Fi card continues to fail, consider temporarily using a USB Wi-Fi adapter. This helps you maintain a stable connection while you troubleshoot internal card issues. You can start by connecting directly to the network with an external usb card.

6. Check the Windows update

Make sure your Windows is up to date. Sometimes updates include critical fixes to hardware compatibility.

7. Reset the network Settings again

If the previous reset did not work, you can try to reset the network Settings again:

Go to Settings > Network & Internet > Status.

Scroll down and select Network Reset.

8. Reinstall Windows

If all of the above solutions don't work and you suspect a software problem, consider a fresh installation of Windows. If this problem still occurs with a fresh installation, it is almost certain to be a hardware problem.

Best regards

Bobhe | Microsoft Community Support Specialist