I think your AI gave the answer already.
1x M.2 Key B USB interface
1x M.2 KEY M PCIe interface
You type a long story , but which hardware are you trying in which m 2 slot?
As he uses a modem and a nvme normally one one combination is possible without adapters. Nvme in key-m which should work and modem in key-b which is recognized via usb (afair no pcie there).
So then everything functions as it should then.
atf.dts (28.2 KB) ubuntu_clean_new.txt (27.1 KB) Something I’ve been working on lately—can you verify it?