1) I attached a screenshot of my BIOS settings
2) I followed the guide and tried the two SSDT patches (using OpenCore). But I assumed that the TB tree should be visible if activated - no matter if the patched are there or not?
3) I tried flashing back the original firmware and boot into macOS to be able to show you the ioreg with an attached device but I get a kernel panic (page fault) now for some reason - could be the RX580 drivers. Connecting a TB-Dock before boot made it work but TB-Tree was minimal.
4) I tried flashing the firmware used by
@scottkendall from
here + the SSDT patches from the guide: The full TB tree showed up but no connected TB3 devices (but USB-C worked). Stange thing: Same behavior even when booting without the patches enabled.