Everything I found about the problem was yours. Your idea is that something is wrong "code" in the bios.It doesn't really seem WiFi whitelist related... but instead some other BIOS problem.
But that's just a guess.
Glad to hear you're back in the game! I follow this thread solely for the fact that I own a Lenovo T440s, which is very similar to the hardware of your machine. Your guide has helped me in a few scenarios.Hey everyone... long time no talk. Umm, I've been using this setup for a few years now. This isn't my daily os, there are some weeks where I don't boot into OSX at all. That being said, it was always a goal to get this closer to a perfect setup.
As a quick recap: This laptop was shipped with an Intel AC7265 network card which has no chance of working with OSX. I got an external usb dongle and that allowed me to have wireless internet but I hated sacrificing a usb port for terrible and non-native internet. I bought a Dell DW1560 and installed it in my laptop (BCM94352Z) and that card worked on OSX but not on Windows or Linux no matter what I tried. The card was recognized but no networks would ever appear. (I even found the wifi disable pins and taped them!) I also tried the Lenovo version of the BCM94352Z (Lenovo P/N: 20-200480) and it demonstrated the same behavior.
I gave up on getting those cards to work, but a new found motivation hit me recently to try again. I ordered a Dell DW1830. The 1830 is a lot bigger than the 7265 and the DW1560. The NVME drive must be removed before installing the 1830 and it's a very tight squeeze. I'm happy to report that for the past couple of hours, I have had wifi on both Windows and OSX with the Dell DW1830! Linux is not working yet, it freezes when connecting to networks. I've had to disable and re-enable the network adapter in Windows upon reboot a couple of times.
There are a few quirks that I will find workarounds for but the 1830 is definitely a step in the right direction for this laptop.
I am going to continue messing around over the next few days and will likely attempt a High Sierra install, if/when I get to that point I will write a new guide for everyone!