To create the SD card I use the shell under osX or Linux : sudo dd bs=1m if=<your image file>.img of=/dev/<disk# from diskutil>
Though these utilities are recommended in the how to, I don’t know if they modify the boot sequence. If it works, perfect, but keep in mind that could be a cause of your issues. In order to be exactly in the same conditions as my setup, try to install it with the dd method, apply the patch and reboot.
What version of Raspberry Pi3 do you use? I am working on a standard Pi3 first version. In the Pi3 B+ they changed the WiFi chipset. It may be a cause of your WiFi issue. Installing the right driver should help.
A beginning of answer : https://raspberrypi.stackexchange.com/q ... rry-pi-3-b