HP Z440, Z640, and Z840 Workstation Series - Maintenance and Service Guide

4. Save and exit BIOS.
5. Press F1 when prompted to accept the clearing of the TPM nonvolatile memory.
6. Download the latest BIOS for this system and operating system o of the HP website.
7. Follow the instructions on the website to ash the BIOS. This will clear all settings and passwords
related to the BIOS.
8. Power down the system and remove the AC power cord. The RTC and Super I/O battery backed-up
memory is cleared by removing the battery found on the motherboard, allowing the board to sit for
greater than 60 seconds, and then replacing the battery.
The DIMM SPD EEPROM is not readily available to the user, however there appear to be tools publicly available
to read and write this part. To eliminate the possibility that it could contain sensitive information, remove the
DIMMs or use one of these tools.
Z840 Workstation
HP conrms that Intel-based Z840 personal workstation contains DDR RAM volatile memory (memory
amount depends on the customer conguration). In addition, the motherboard in the condition originally
shipped without subsequent modication or the addition or installation of any applications, features, or
functionality, contain the following nonvolatile memory: PCH Real Time Clock (RTC) battery backed-up
conguration memory (256 Bytes), Super I/O battery backed-up conguration memory (16 Bytes), SAS FLASH
memory (32Mbits) and an EEPROM (64K Bits), masked keyboard ROM (2K Bytes), secondary LOM Flash (4
Mbits), DIMM Serial Presence Detect (SPD) conguration data (256 Bytes per module, 128 Bytes
programmable), TPM module (2.35 kB), and Serial Flash IC for System BIOS (128M Bits).
The volatile memory is cleared by removing power from the system for greater than 30 seconds. The
nonvolatile memory on the motherboard is restored by following the steps below:
1. If TPM Ownership has been taken enter F10 setup.
2. Navigate to the Security tab.
3. Select TPM Embedded Security > TPM Clear > Clear.
4. Save and exit BIOS.
5. Press F1 when prompted to accept the clearing of the TPM nonvolatile memory.
6. Download the latest BIOS for this system and operating system o of the HP website.
7. Follow the instructions on the website to ash the BIOS. This will clear all settings and passwords
related to the BIOS.
8. Power down the system and remove the AC power cord. The RTC, Super I/O battery backed-up memory
and LSI 2308 SAS controller battery backed memory is cleared by removing the battery found on the
motherboard, allowing the board to sit for greater than 60 seconds, and then replacing the battery.
The secondary LOM Flash is inaccessible to the user via any publicly available tools. There are programs used
by HP in manufacturing and R&D that allow access, but these are not available outside of HP. The embedded
LSI 2308 SAS controller ash ROM can be read, written, and erased via a rmware and BIOS utility
SASFLASH.exe available in the latest soft pack release on the HP website. The embedded LSI 2308 SAS
controller battery backed memory can be erased following the instructions stated above in step 8. The DIMM
SPD EEPROM is not readily available to the user, however there appear to be tools publicly available to read
and write this part. To eliminate the possibility that it could contain sensitive information, remove the DIMMs
or use one of these tools.
122 Appendix D Statement of Volatility