Looking for virgin/clean dev BIOS for HP ZBook Studio G8 (LA-K721P, T92 family)

[Smarty]

Hi everyone,

I have an HP ZBook Studio 15.6 inch G8 with a BIOS password lock that I've been trying to remove.

My unit:
- Model: HP ZBook Studio 15.6 inch G8
- Product ID: 553R1UC#ABU
- Serial: CND2061CZ3
- Board: LA-K721P (Compal)
- BIOS family: T92
- BIOS chip: Winbond 25Q256JVEN (U6, 32MB)
- EC chip: Winbond 25Q256JVEN (UK2, 32MB)

What I've tried so far:
- A forum member kindly patched my EC (UK2) — password removed, that worked.
- I also tried a set from a 62T25EA model (same board, same T92 family). With that set, all storage devices (NVMe + USB) are detected and the laptop boots into Linux Mint. However:
- I get an HP Endpoint Security Controller (ESC) error on every boot
- The AC adapter is recognized as "Unknown" — battery only charges when the laptop is powered off
- The original BIOS from my own dump (with serial changed) doesn't detect any storage devices at all (no NVMe, no USB)

What I need:
A virgin/dev BIOS (U6, 32MB) for the T92 family — ideally from a service manual, HP factory image, or someone with the exact same 553R1UC model. No serial, no password, no DMI data — just a clean BIOS that I can flash and then program the DMI myself.

If anyone has a clean BIOS dump or factory image for this board, I'd really appreciate it. I have my original dumps attached in my previous post for reference.

Thanks in advance!

https://filebin.net/n8k8cg0bx3z8j4mo