Hello there.

I am trying to update my bios to revision a22 from revision a11, I have created a bootable usb drive with all of the necessary files, and when i select my bootable flash drive, and put in the proper commands in the command prompt ie: cd locale/LOCALE> O755-a22, it restarts as it should, and then appears with an error saying,"firmware image not detected in memory." Any help would be much appreciated, thanks!

Operating system: windows 10

Computer: Dell OptiPlex 755