I'll do a small contribution, but hopefully will help someone.
Here are the steps I follow to BUILD the itlwm.kext with Xcode:
1. Download ZIP
2. Open the xCodeProject
3. Select the fwGen > my Mac (in the right of the Play and Rea buttons)
4. Press Play button to build the file, and if suggested, click on update.
5. If any Issue (or Suggestion), Perform the changes. Otherwise, step 7 will display Build failed error message.
6. Select the itlwm > myMac
7. Click play again
8. In the top left, press the folder, and then go to Products, and show in Browser, and copy to your folder.
9. Show .kext content, and open Info.plist > IOKITPersonalities > itlwm > WiFiConfig > Hardcode the networks you want to use (I think you can put up to 4 Netowrks, and guess it will connect to any available of those 4? No idea, to be honest!).
Also, I'll attach two command files, which will auto install the itlwm.kext or the AppleIntelWifi.kext by double clicking them (and writing the user's password on the terminal window that will open) for easier installation.
To use them, you have to place your itlwm.kext or your AppleIntelWifi.kext (or both) inside a Desktop folder called "Intel WiFi".
Finally, regarding the the video in post #548, the .kext provided is the AppleIntelWifi.kext, version 1.2.3 (you can check by opening the Info.plist inside the .kext), not V2, so let's call it by its proper name please to avoid confussions. It's exactly the same .kext that was uploaded in post #434 (Still no idea where they get it from, though).
Latest AppleIntelWifi.kext, download speed round 80Mbps @ 5G network.
View attachment 471410
NWID = your SSID
WPAKEY = your PWD
View attachment 471411
Edit: more firmware modules are added in this version, basically all Intel wifi modules, if you have older module like N2230 or newer module like AX200, try this kext, may work, but not sure.
View attachment 471414