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When Secure Boot is enabled, it is initially placed in "setup" mode, which allows a public key known as the "platform key" (PK) to be written to the firmware. Once the key is written, Secure Boot enters "User" mode, where only UEFI drivers and OS boot loaders signed with the platform key can be loaded by the firmware.
A PBA environment serves as an extension of the BIOS, UEFI or boot firmware and guarantees a secure, tamper-proof environment external to the operating system as a trusted authentication layer. [2] The PBA prevents any operating system from loading until the user has confirmed he/she has the correct password to unlock the computer. [2]
Motherboard firmware (including BIOS and UEFI) can be updated using USB flash drives. Usually, new firmware is downloaded and placed onto a FAT16- or FAT32-formatted USB flash drive connected to a system which is to be updated, and the path to the new firmware image is selected within the update component of system's firmware. [52]
CPUID leaves greater than 3 but less than 80000000 are accessible only when the model-specific registers have IA32_MISC_ENABLE.BOOT_NT4 [bit 22] = 0 (which is so by default). As the name suggests, Windows NT 4.0 until SP6 did not boot properly unless this bit was set, [ 6 ] but later versions of Windows do not need it, so basic leaves greater ...
EAI—Enterprise Application Integration; EAP—Extensible Authentication Protocol; EAS—Exchange ActiveSync; EBCDIC—Extended Binary Coded Decimal Interchange Code; EBML—Extensible Binary Meta Language
Though a support document listed October 4, 2021, as the initial release date, [65] Microsoft officially released Windows 11 on October 5, 2021, [8] [66] as an opt-in, in-place upgrade through either the Windows 11 Installation Assistant application (which can perform the upgrade, or generate an ISO image or USB install media), or via Windows ...