We have recently changed the motherboard of this laptop but other parts such as WIFI/WWAN and PCB of it remains the same. Now there appears an error 1802 of unauthorized error appears whenever the card for WWAN is attached. I was forced to remove it. The model of the card is Fibocom Model: L830-EB.
Bios Link: https://download.lenovo.com/pccbbs/mobiles/r0suj31w.exe
Bios Link: https://download.lenovo.com/pccbbs/mobiles/r0suj31w.exe