Need help to make Dell BIOS Update

Hello,

i would like to make an update of bios  on DELL Computer.

I've got the bios exe files but when i create the schedule task installation didn't works

I ve create a batch file with this command:

start "Latitude_5X80_Precision_3520_1.9.3.exe" /s /p=password

But it doesn't works,

Please could you help me

Thanks