Questions And Answers - HP Z Series Maintenance And Service Manual

Table 11-1 Troubleshooting steps for nonvolatile memory usage (continued)
Nonvolatile
memory type
802. 1 1 WLAN
EEPROM

Questions and answers

Use this section to answer your questions about nonvolatile memory.
1. How can the BIOS settings be restored (returned to factory settings)?
IMPORTANT:
drive. See question and answer 6 for steps to securely erase information.
The restore defaults feature does not reset the Custom Secure Boot keys. See question and
answer 7 for information about resetting the keys.
a. Turn on or restart the computer, and then quickly press esc.
b. Select Main, and then select Apply Factory Defaults and Exit.
c. Follow the on-screen instructions.
d. Select Main, select Save Changes and Exit, and then follow the on-screen instructions.
2. What is a UEFI BIOS, and how is it different from a legacy BIOS?
The Unified Extensible Firmware Interface (UEFI) BIOS is an industry-standard software interface
between the platform firmware and an operating system (OS). It replaces the older BIOS
architecture but supports much of the legacy BIOS functionality.
Like the legacy BIOS, the UEFI BIOS provides an interface to display the system information and
configuration settings and to change the configuration of your computer before an OS is loaded.
BIOS provides a secure runtime environment that supports a Graphic User Interface (GUI). In this
environment, you can use either a pointing device (touch screen, touchpad, pointing stick, or USB
mouse) or the keyboard to navigate and make menu and configuration selections. The UEFI BIOS
also contains basic system diagnostics.
The UEFI BIOS provides functionality beyond that of the legacy BIOS. In addition, the UEFI BIOS
works to initialize the computer's hardware before loading and executing the OS; the runtime
environment allows the loading and execution of software programs from storage devices to
provide more functionality, such as advanced hardware diagnostics (with the ability to display more
detailed system information) and advanced firmware management and recovery software.
3. Where is the UEFI BIOS located?
Amount (Size) Does this
memory
store
customer
data?
4 kilobits to 8 No
kilobits
The restore defaults feature does not securely erase any information on your hard
Does this What is the
memory purpose of
retain data this
when memory?
power is
removed?
Yes Stores
configuration
and
calibration
data.
How is data entered into How is this memory
this memory? write-protected?
802. 1 1 WLAN EEPROM A utility must be used
is programmed at the for writing data to
factory. Tools for writing this memory and is
data to this memory are typically not made
not made public. available to the public
unless a firmware
upgrade is necessary
to address a unique
issue.
Questions and answers 99