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The original WIFI module in Dell Inspiron 3668 was Qualcom which isn’t supported with Big Sur, so I replaced with an Intel AC7265 that came with one of my laptops. This module is supported with correct Airportitlwm.kext for Big Sur and it’s working perfectly. We don’t need the bluetooth driver since it’s supported natively.
macOS Big Sur has quite a security upgrade that causes many problems for installing software sometimes. This is how I backup my DVDs to MP4 for playing digitally. We need brew install, Handbrake.
If you still have old tapes from video recorders and you want to transfer those memory videos to PCs or Laptops, you can use a device called easyCAp, quite inexpensive and actually works wonder with the right software. You will need the correct driver “smi-usb-grabber” for the device and capture software like OBS studio or VLC video