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 support case. If you buy a module via official channels then you will get support there too
Besides, I would like to share some solutions you can try:
- Try to follow the topic which has similar concern
EM7455 Dell rebrand/profiles
Please share if you have any concerns
Thanks