Latitude 3510 laptop owners have reported that running with only the battery connected, the DW5820e WWAN (Wireless Wide Area Network) card is sometimes not detected.
However, if you boot the system with the AC adapter connected the WWAN card works fine.
Updating to the latest BIOS version available for the computer will resolve the issue. To download and install the latest BIOS:
Browse to the Dell Drivers and downloads page:
Select the Operating System.
Under Category, select BIOS.
Locate the latest Dell Latitude 3410 and 3510 System BIOS. (Version 1.6.0 or newer.)
Click Download and save the file to your computer.
Open File Explorer and browse to the location where the downloaded file is saved.
Double-click the BIOS setup file and follow the on-screen instructions to complete the installation process.