Good news, I got it!!
So with the bios I tried before (f.69 it didn't work) so I used an older one and searched for the SN in the old dump file. And with found, I copied length 1000 and could flash it. First boot up was really long, I already thought it's not working, but as the caps lock blink was away and I heard the Dvd-tray surring, I knew it is Alive again..
Serial number, model number everything is there in the bios!

Thanks for your help [USER="391642"]hoaca388[/USER]!hoaca388...

Ok, found sn number at 003AA00. How long is it? Till the "$END" in the text?

And the code for windows key isn't found in the bin file. So I assume that there was no key saved?...

Hey,
I have an HP 250 G6 with board DKL50 CSL52 LA E821P and SN CND8065P5W with a corrupt BIOS. I already read the BID of the old BIOS and know that I need the bios 0832E.
Now I want to copy the DMI information to the new BIOS I downloaded from the HP website.

But I don't know exactly the range which I should copy.
So Start is 210000, that is clear.
But in the thread there are different end sectors.
I guess 210FFF (length 1000) is ONLY DMI.
But what about with windows key? is it
21103F (length 1040) OR
211FFF (length 2000)
...

Hey, I'm Johannes, 23, and I updates the laptop of my sister and the bios got crashed.. So my sister isn't that happy and now I'm trying to fix the bios woth the ch341a programmer