Need help upgrade BIOS HP Prodesk 400 G1 DM

Hi @ all,

i have some problems with updating my BIOS from a HP Prodesk 400 G1 DM.
I bought the HP a few days ago, arrived at saturday.
The BIOS Version is a old version from 2016.
On the website from HP there are a lot of newer versions for this model. Checked with serial and part number.…pc/7519860

My BIOS Version looks not like the versions on the website.
See informations file attached.

My BIOS Version said: BIL_80.19

On the Website, there are only BIL_02.XX!

I think that actually its a custom bios.

I tried to install the new BIOS file over the BIOS “Flash ROM”.
But i get a message, that its not compatible. "Incompatible rom image"

Tried to flash the image using fpt (dos version) and it shows a message "PDR Region does not exist."
I also have errors "Error 7: Hardware sequencing failed. Make sure that you have access to target flash area!"

Can someone help to update to the newest version please?