It seems Catalina is missing a driver for an older WiFi chip that was there in Mojave, resulting in a computer without recognized WiFi hardware (!) – see also https://discussions.apple.com/thread/250720965 and https://apple.stackexchange.com/que...alina?newreg=1904677ef3d840f0a87b73a2cd7bd342
The steps below worked for me. Modified drivers by Alex on Apple's boards, thanks.
The steps below worked for me. Modified drivers by Alex on Apple's boards, thanks.
- Download the modified wifi drivers and unzip > you get a folder named WiFi_kexts
- Boot into Recovery Mode: restart your computer while pressing and holding cmd-R
- Open > Utilities > Terminal via Menu Bar
- Type csrutil disable and hit return
- Type reboot and hit return > computer reboots normally
- Open > Utilities > Terminal and enter cd and hit the space bar (don't hit return)
- Drag the folder WiFi_kexts onto the Terminal window and hit return
- In Terminal, enter sudo mount -uw / and hit return, then enter your user password and hit return
- Enter sudo cp -r IO80211Family.kext /System/Library/Extensions/ and hit return
- Enter sudo cp -r IO80211FamilyV2.kext /System/Library/Extensions/ and hit return
- Right-click on Kext Utility in the folder WiFi_kexts and choose open, click open in the following dialog, authenticate with your password
- Wait for Kext Utility to complete – this took maybe two minutes on my setup, and I got an error message in the end, as well as "All done"
- Reboot your computer normally and enjoy WiFi in Catalina
- If you want to turn on SIP again you can boot into recovery mode again and enter csrutil enable (hit return) reboot (hit return)
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