Run the BIOS update utility from DOS environment (Non-Windows users)
NOTE: You will need to provide a bootable USB key. This executable file does not create the DOS system files.
Copy the file JL-140.EXE to a bootable USB key.
Boot from the USB key to the DOS prompt.
Run the file by typing Y:\JL-140.EXE (where y is the drive letter where the executable is located).
https://www.dell.com/support/home/us/en ... tfk2n#3DOS