Just for reference, there is also a thread about the L14xCU on the notebookreview forum: http://forum.notebookreview.com/threads/clevo-l140cu-l141cu.831690/
And another one on reddit:
I guess I can swap it out against a M.2 SATA SSD but that would be a lot slower. The fast NVMe SSD was one of the reasons I chose that model. But yes, if I don't find another solution I will have to do that...
Sorry to resurrect the old topic. I ran into the same problem (or even worse, I only have a NVMe SSD, so right no I can't use my Lafite Pro 14).
I discovered the thread a bit too late (just after I received the shipping).
Did anybody manage to install Linux on a NVMe with the PCS supplied BIOS...