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what? the Intel wifi? You can follow the status linked above https://github.com/AppleIntelWifi/adapter

Yes, but you have to have 2 things: EFI partition = 200MB or more (windows default is 128MB, verify it, expand if necessary) Must have GUID formatted drive (Windows might be formatted to MBR - you'll need to convert it) I won't be able to help you with any of the 2 requirements, you'll have to figure that out yourself with google or whatever way you know You can try cloning Windows to another drive, format your disk to the requirements above, create 2 partitions and then restore Windows to the second partition and install MacOS to the 1st.

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Just to be sure, you're following the Catalina guide for Catalina, right? Because your initial link pointed to the Mojave guide. Would I be right to assume that you're installing Catalina 10.15.4? I might need to revisit Catalina's installation guide given that there were many issues with the 10.15.4 update. Will try a fresh 10.15.4's installation on the 7490 to see...

If you had been patching your own DSDT recently, you most likely encountered this common error dialogue when clicking on the 1st 2 errors, they'll take you to these set of codes To fix the errors, I created this patch which you can just apply with latest version of MacIASL This will fix all 3 errors listed above. Enjoy!