Yes, 8.1.0.XXXX is fine.
I hope you didnt do any flash with a bad RAM stick. And fwiw there is no 3 stick 24GB RAM profile for these mobo -
I might note, as you said, that the bios 1908 should have updated ME to 8.1.2.1318 (V-Pro). This bios is a real fakeout - its a two step flash, first the...