M.2 connector soldering

What do you think, is the m.2 wired to the pcie lane of the cpu? Should i try to solder an m.2 connector to the board?

Nah. The m.2 key b is only for sim adapter cards. No sata or pcie or usb3.0 lanes :smiling_face_with_tear: just usb 2.0 and some serial.