EOSL manual Secure Boot certificate update solution - HP ProBook 450 G5 Baseboard 837D

[Syntheros]

Product: HP ProBook 450 G5

Operating System: Windows 11 Version 10.0.26200 Build 26200

Hello,

I am requesting the EOSL manual Secure Boot certificate update solution referenced in HP document ish_13070353‑13070429‑16 (“HP Business PCs – Prepare for new Windows Secure Boot certificates”).

My device meets the criteria for the EOSL manual update path:

• Model: HP ProBook 450 G5 (baseboard 837D)

• BIOS: Q85 Ver. 01.31.00 Rev.A (latest available, released 2025‑02‑11)

• OS: Windows 11 Version 10.0.26200 Build 26200

• TPM: 2.0

• Secure Boot: enabled and functioning normally

Current certificate state: Windows has applied the Windows UEFI CA 2023 certificate to the UEFI DB, and the boot manager is 2023‑signed. However, the remaining certificates — KEK 2023, Microsoft UEFI CA 2023 (3P), and Option ROM UEFI CA 2023 — are blocked by Windows servicing with Event ID 1802, SkipReason KI_7, which Microsoft identifies as a known HP firmware limitation.

Because the ProBook 450 G5 is outside HP’s supported‑platform BIOS list, no firmware update will resolve this. Therefore, I need the manual EOSL Secure Boot certificate update package and instructions for applying it.

Please provide the EOSL update files and the procedure.

Thank you.

[Kuroi_Kenshi · Accepted solution]

Hi @Syntheros,

Thank you for providing all the details.

Regarding the HP ProBook 450 G5, this platform is not listed as a supported platform for the new Windows Secure Boot certificate update process.

You can verify the supported-platform list in HP's official documentation here:

HP Business PCs – Prepare for new Windows Secure Boot certificates

Regarding the BIOS, HP does have a BIOS update available for the ProBook 450 G5. The latest BIOS information should be checked against your exact configuration on the HP Software and Driver Downloads page. If you have not already installed the BIOS update released on February 11, 2025, I recommend updating to that version first.

HP ProBook 450 G5 Support and Drivers

Once the BIOS is updated, you can recheck the Secure Boot certificate status. However, because the ProBook 450 G5 is not included in HP's supported-platform list for this certificate update process, we cannot provide an EOSL manual certificate package through the Community.

Please let us know if you have already installed the February 11, 2025, BIOS update.

Best regards,
Kuroi_Kenshi