In the mini PCI-e slot - USB determines if there is no PCI, can it be configured?

Question

Iron

I recently bought a single- board computer on Aliexpress with a soldered processor and two mini PCI-e slots. One of the slots promises to work with Wi-Fi cards or 3G / 4G, there is also a SIM slot next to it. The second is given under mSATA.
The problem is that in the first slot, the 3G card in Linux is visible as a USB device, and Wi-Fi is not visible at all (should be visible as PCI).
Has anyone encountered such a problem?
There are hypotheses - either the PCI lines are not soldered, or it is disabled in the BIOS, or there is a secret Jumper. In the product description, it was written that WiFi should work by default, and if you need 3G / 4G, then “write us and we will do something before shipping.”
There was an item in the BIOS that turned on the OEM mode with settings for almost everything - from bus timings to disabling Intel ME. I looked through all the settings, I did not find anything suitable.
The board has an i5 6200U SkyLake processor and 6 * 1Gb LAN. There is another hypothesis that one PCI-e channel can be given either to a mini PCI-e slot or to a network port.
In general, I don’t know much about hardware, and the Chinese don’t answer the question yet, so I’m asking here.

Answer 1

In a mini-pcie, the slot can be either PCI-E or USB + SATA (well, either only USB or only SATA). When there are 2 slots in a laptop - usually one is made as PCI-E and it has wi-fi, and the second slot is for modems, and they are USB, and therefore USB is put into the second slot, but PCI-E is not there.
In short, it's physical, so if you have specific equipment, you need to look for a jumper.