/forceit in Command Prompt Gives error: unknown command

Solution 1:

• Make Bootable FreeDOS USB Drive personally I used Rufus Portable.
• Copy the BIOS EXE File. Mine was 3442A14.exe for Inspiron 3542.
• Restart computer and press F12 at boot logo.
• Boot the USB Drive.
• DOS window should appear now type the first letter of the filename and then press tab or type the full name of the file followed by /Forceit
• Press Y to continue update. Update should prepare files the restart and then start updating with percent bar repeated several times and then restart to start Windows with BIOS updated.

Solution 2:

/forceit is not a command of its own, you need to use it as a command line parameter like DellBIOSUpdater.exe /forceit.