Bios not updating

You cannot update the BIOS with a dead or almost dead battery. 

So it can't update even if the computer is plugged in?

Does it happen with all executable file?

Let’s manually update BIOS on the computer.

Click the link below to download and install BIOS on the computer:

http://dell.to/190Vaa5

• During BIOS update verify that the computer is connected to an AC Adapter.
• Disconnect any third party peripherals connected to the computer before performing BIOS update.
• Do not turn off the computer during the BIOS update.
• Do not restart the computer during the BIOS update.
• Ensure battery charge is more than 20%.

Note: Plug your computer to a good, working wall jack before you update the BIOS. If you experience a loss of AC power or a significant voltage sag/spike during the BIOS flash, you will either have to buy a new BIOS chip or buy a new motherboard.