UEFI Capsule BIOS Update Whitepaper on WU_4.2

HP ProBook 640 G4 Notebook PC

HP ProBook 650 G4 Notebook PC

HP ProBook 430 G5 Notebook PC

HP ProBook 440 G5 Notebook PC

HP ProBook 450 G5 Notebook PC

HP ProBook 470 G5 Notebook PC

HP ZHAN 66 Pro G1

HP ProBook 455 G5

HP ProBook x360 440 G1 Notebook PC

HP mt21 Mobile Thin Client

HP mt31 Mobile Thin Client

HP Engage Go Mobile System

HP ProBook x360 11 G3 Education Edition

Why is HP Releasing BIOS Updates as Automatic via Windows Update?

Modern devices depend on up-to-date firmware for performance and security. Updating a system BIOS

can be challenging, particularly as remote work is proliferating and leveraging Windows Update for BIOS

updates simplifies the process. The additional advantage of servicing BIOS via Windows Update

is,security vulnerabilities which require a BIOS update can be remediated in a quick, efficient and

automatic manner. HP believes this change is in the best interest of our customers and will increase

adoption of updated system firmware without undue end-user friction.

How is BIOS Updated Through Windows Update?

To update system firmware Windows Update leverages a mechanism built into the Unified Extensible

Firmware Interface (UEFI) standard called UEFI Capsule.

What is UEFI Capsule?

UEFI capsule is a mechanism which is used to pass the data from runtime (OS present) to UEFI BIOS.

UEFI capsule consists of header with a GUID to identify device and content, along with a firmware image

and code that handles the secure update process. UEFI capsule is delivered by device vendors to

Windows systems via Microsoft Windows Update service or Linux systems via Linux Vendor Firmware

Service (LVFS). A UEFI capsule update package includes the UEFI capsule and other files that work with

the OS update service. With UEFI capsule, firmware updates behave the same way as software/driver

updates at the OS level, but updates occurs in the more secure and stable UEFI environment.

Does HP Already Submit BIOS to Windows Update?

Yes. Today HP submits BIOS updates to windows update as manual/optional updates.