I'm posting after having searched a few days for this.
I have two E6530's and just got a third one for a friend.
It's stuck on A09.
I've created a Rufus - DOS boot thumb drive for the current A20 and successfully used it to update another one of the E6530's but this one doesn't update. (The updater always goes through the steps, acts as if it's worked, and then the BIOS is once again not updated.
I have removed and reinstalled the CMOS battery (twice).
I have reformatted the hard drive.
I have tried updating using every rev from A11 upward (11,12,13,14, etc.) from the DOS boot. (Right now the hard drive is wiped until I get this done, so I know it's not something on the HD blocking it.
I read that some of the BIOS updates wouldn't work with more than 4G of RAM, so I pulled 4G and now it just has 4G.
So with nothing on the hard drive, 4G of RAM, booting from the DOS thumb drive (that worked on the other E6530), it keeps looking as if it's flashing, but on reboot it's still A09. Like some sort of malignant perma-bios.
I'm apparently not the only person who has suffered from being stuck at A09:
A10 may be the answer, but it's not on the Dell site, and I haven't found it anywhere yet.
Many thanks for help with this one.