HP EliteBook 745 Maintenance and Service Guide - Page 113

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Table 13-1 Troubleshooting steps for nonvolatile memory usage (continued) Nonvolatile memory type Amount (Size) Does this memory store customer data? Does this memory retain data when power is removed? What is the purpose of this How is data entered into this How is this memory memory? memory? write-protected? upgrade is necessary to address a unique issue. Fingerprint reader 512 KB flash Yes Yes (select products only) Stores fingerprint templates. Fingerprint reader memory is programmed by user enrollment in HP ProtectTools Security Manager. Only a digitally signed application can make the call to write to the flash. Questions and answers 1. How can the BIOS settings be restored (returned to factory settings)? IMPORTANT: Restore defaults does not securely erase any data on your hard drive. See question and answer 6 for steps to securely erase data. Restore defaults 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 press esc while the "Press the ESC key for Startup Menu" message is displayed at the bottom of the screen. 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 is a replacement for 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 run-time 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 run-time 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. HP has provided options in Computer Setup (BIOS) to allow you to run in legacy BIOS, if required by the operating system. Examples of this requirement would be if you upgrade or downgrade the OS. 3. Where does the UEFI BIOS reside? The UEFI BIOS resides on a flash memory chip. A utility must be used to write to the chip. Questions and answers 103

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Table 13-1
Troubleshooting steps for nonvolatile memory usage (continued)
Nonvolatile
memory type
Amount (Size)
Does this
memory
store
customer
data?
Does this
memory
retain data
when power
is removed?
What is the
purpose of this
memory?
How is data entered into this
memory?
How is this memory
write-protected?
upgrade is necessary to
address a unique issue.
Fingerprint reader
(select products
only)
512 KB
flash
Yes
Yes
Stores
fingerprint
templates.
Fingerprint reader memory is
programmed by user
enrollment in HP
ProtectTools Security
Manager.
Only a digitally signed
application can make the
call to write to the
flash.
Questions and answers
1.
How can the BIOS settings be restored (returned to factory settings)?
IMPORTANT:
Restore defaults does not securely erase any data on your hard drive. See question and
answer 6 for steps to securely erase data.
Restore defaults 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 press
esc
while the “Press the ESC key for Startup Menu”
message is displayed at the bottom of the screen.
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 is a replacement for 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 run-time 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 run-time 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.
HP has provided options in Computer Setup (BIOS) to allow you to run in legacy BIOS, if required by the
operating system. Examples of this requirement would be if you upgrade or downgrade the OS.
3.
Where does the UEFI BIOS reside?
The UEFI BIOS resides on a
flash
memory chip. A utility must be used to write to the chip.
Questions and answers
103