Lenovo t480 EM7455 boot error: 1802 unauthorized network card plugged in

[jyijyi]

Does this help?

Lenovo EM7455 on Dell Precision 3520 laptop

Hi @neagugeorge , Were you able to access AT command when you got exclamation mark? Any interfaces appear? The issue appears since you’ve used Lenovo EM7455 on Dell laptop. As my opinion, the card is belongs to the OEM cards are obviously meant to be supported by Dell or Lenovo, and not directly by Sierra Wireless. This means that Sierra Wireless will refer you to Dell or Lenovo for support, and they will probably want to know the serial number of your laptop before they let you open any supp…