I received my laptop in France on October 18th.
As I live in both Japan and France, but was not in France when it arrived, I had to wait for my parents to send it to me, and I started to use it only from this week-end.
I immediately noticed that my thunderbolt dock was not working anymore. But, weirdly enough, my thunderbolt eGPU still works.
Here is where I found another user with the same laptop and thunderbolt dock as mine, on Linux too, but who had no problem using it:
So, my conclusion was that I ought to try the v3.04 BIOS…