Biggest cheers to you!!!
With this file I reflashed 2 devices.
This is step by step how I did that.
1 - Run HP BIOS Configuration Utility (BCU) - to backup original ID's.
1.1 - hpbiosconfigutility.exe /getconfig:"backup_id.txt"
1.2 - store it somewhere where you can take it when it need.
1.3 - Edit backup_id.txt, find inside string starts "Manufacturing Programming Mode" replace

1.4 - Save with replace.
2 - Desolder flash from motherboard.
3 - Put FLASH chip to programmer (in my case I used CH341A (green version))...

YEEEHAAA!
Thanks for help for this PC.
The problem why I get 5 long 7 short buzz, is bad flashing.
Change programmer and usb port, reflash - bingo.
PC starts, bios unlocked.
Can you help me with another bios?

HP ProDesk 400 G6 Desktop Mini PC Bundle (260N1ES)

S/N 8CC0491XGP...

After reflash with last file i have 5 long and 7 short buzz....

This is hp prodesk 400 g6 mini
S/N 8CC0491XG8...

Hello and thanks for help.
But now I have another problem
I reflashed bios that you gave me and get this error.
When pc boot, first i see it is.
...

Hello,

I have 2 BIOS locked HP PC's from an auction
I dumped the BIOS and tried unlocking but the RCUnlocker procedures failed because it's a 32mb bios
Could someone please unlock the bios dump for both PCs?

Thank you

HP ProDesk 400 G6
Serial number: 8CC0491XGP
Product number: 260N1ES

HP ProDesk 400 G6
Serial number: 8CC0491XG8
Product number: 260N1ES​...

Hello everybody!
Can someone help me with unlock bios?
Dumped bios is in attach, with much thanks....