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Punch Card
Posts: 28
Registered: ‎03-29-2017
Location: NO
Views: 8,065

X1 Carbon 5th gen - Sierra EM7455 WWAN - SIM not recognised

Hi all,


I just received my new X1 Carbon 2017 (20HR) a few days ago, but am struggling with the WWAN.


  • Windows 10
  • Tried 3 different SIM cards (2 different providers), which all work fine on a mobile phone
  • Sierra EM7455 looks fine in Device Manager
  • Uninstalled Sierra drivers and reinstalled (current ver 10.0.14393.0)
  • (Re)installed the only related package I could find on Lenovo's website (Sierra Wireless EM7455 Software for Windows 10 (64-bit) - ThinkPad X1 Carbon (Machine Type 20HQ, 20H...
  • Downloaded the latest drivers and firmware from Sierra's website, however I obviously already had the latest as it did not install anything.

... no luck. Diagnostics confirm "No SIM card inserted".

Since there is only one way to insert the SIM, I am sure it is inserted correctly.


Any suggestions...? Would be such a pity if it is a defect on a brand new laptop...


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