Hello
@chris77555,
Welcome to the forum. However, I have to caution you very strongly against flashing the Thunderbolt firmware. At the top of the Z490 Vision D build guide, we have this note/warning:
View attachment 504466
I know you have an Apple Thunderbolt Display, but it is very old now and there are lots of wonderful 27-inch monitors on the market today at very competitive prices. They offer HDMI 2.0, DisplayPort 1.2/1.4, and even USB-C. Some have speakers and USB hubs built in.
Thunderbolt monitors are
very unreliable on a Hackintosh. There are too many user complaints, which is why I added that note (NOTE 8c).
Additionally, flashing the Thunderbolt firmware is a risky operation and should only be done by experienced users.
I know it's tempting and even exciting to try and flash the Thunderbolt firmware, but I believe this is not a justified reason for doing so.