Hi Alvaro,
I have uploaded the file of the driver that I use. Hopefully, this forum doesn't have any rule that keeps me from sharing a URL. Please try the following link:
https://filedropper.com/d/s/WljNznfQMIlOHZQqur0wDmdl95GY6g
If I recall correctly, I installed this driver through the Windows Device Manager. You will need to download it, unzip the archive, and then go to windows device manager. Look under "Network Adapters" and find "Mediatek MT7921." Right click that and then click "update driver." Choose "browse my computer for driver." Find the folder that you extracted and choose that. If the driver that you are currently using is newer, Windows may say that it already has the best driver. In this case, you will probably have to uninstall the current driver first, then install the driver that I have provided. Anyways, I hope that it works for you. To be honest, it might be easier to simply return the PC. I probably would have already done that but the situation is a bit more complicated for me because I purchased the computer in the USA and then moved to another country... so international shipping is expensive and just more complicated. Thankfully, I have determined that the hardware works correctly and that it is a driver problem.
One other option for you. Another person on this threat named "NickBryson" has suggested a fix that works for him. You may want to try that. I hope it works.