https://www.dell.com/support/home/en-my/drivers/driversdetails?driverid=vgk0r

After clicking the link above,I discovered  the choice of operating system only have WINDOWS XP,WINDOWS VISTA ,32BIT and BIOS only.There are no choice for WINDOWS 7.So,should I download this BIOS A10 update in my windows 7 32 bit computer ?

Welcome to the Dell Community   @inspiron1420user 

It uses DOS to do the update so it should not matter what version OS you have installed.

First method:

Create a new folder on your desktop named “BIOS Update”

Then download your BIOS update from your Driver Support page.

Copy the update to that folder you just created.

Close all Windows and Apps you may have open.

Go to the folder and right click on the update file and “Run as Administrator”

Second method:

Create a bootable USB drive using “Rufus”

https://rufus.ie/

Copy the BIOS update to the bootable USB drive you just created..

Insert USB drive, power-on and start tapping the “ F12 “ key.

Boot from USB and run the BIOS update.

After reboot test and post any results.

Best regards,

U2

thanks for your reply.But now I face another problem,my batttery was damaged and the bios update need a battery.I try the 1420_A10/forceit way in command prompt as a administrator but it still show the error message.So how?

with or W/o battery /FORCEIT is not working! what's the solution ???
Dell does not give an answer on this.

Did you follow the instruction correctly?And is it the same model (dell inspiron 1420)?