The OptiPlex 990 BIOS update package is a DUP-based update package. See that page for command line options. See the passwords section on that page for more information on performing BIOS updates when a BIOS password is set.
* Version A05 MUST be installed before installing version A06 and later.
I have a optiplex 990. My current BIOS is A03. I am trying to update to A19 (the one suggested by the sriver update system at DELL). I get a message that "YOU MUST UPGRADE TO A05 BEFORE FLASHING TO A19
QUESTION: WHERE DO I FIND A05? can't find it anywhere