The Dell BIOS update utility will not allow you to flash the BIOS until the battery is replaced or at a certain level. Click continue and wait patiently as the BIOS is flashed.Although the battery is installed, it has become unreliable. Do NOT disturb your power cord or power down your computer.
Type "DISKPART" and hit "Enter," then type List Disk and hit "Enter." It will give the list of your disk partitions, and will give you the drive numbers of all of your USB disk drives.Type "Select Disk ' N' " where you replace ' N' with the number you saw in the prior step.Do the BIOS upgrade from the stick or from within BIOS if possible.Flashing, or updating, the BIOS of a computer is done to remedy problems with system stability, or to allow the computer to accept larger hard drives or faster CPUs.Press "Enter," then type "cd D:\boot" and press "Enter." This will take you to the "boot" subdirectory.
Type "bootsect /nt60 G:" -- where "G:" is the drive letter of your USB drive.
On many laptops, the BIOS will not update if the battery is not charged, which can be a problem.
This usually prevents the BIOS from being flashed from within Windows.
If your USB thumb drive is drive 1, you'd enter "Select Disk 1." If it were disk 2, you'd type "Select Disk 2." Hit "Enter."Type "Clean" and hit "Enter." This removes all information from the thumb drive.
Type "Create Partition Primary," and hit "Enter." This creates a partition on the drive.
Press "Enter." Close down the Command Prompt window.