The latest verified BIOS version for the HP Compaq dc5800 Small Form Factor (SFF) is v01.60 Rev.A, released on November 27, 2015. Updating this legacy system is critical for fixing microcode errors when upgrading CPUs (like the Core 2 Duo E8400) and ensuring stability for newer operating systems. Preparation Checklist
Identify Current Version: Press F10 during boot or use the HP System Information utility (Ctrl+Alt+S in Windows) to record your current BIOS version and System Board ID.
Power Stability: Ensure the PC is connected to a reliable power source. Do not interrupt the process, as a failure can permanently damage the motherboard.
Security Settings: If using BitLocker, you must suspend protection (Start > Manage BitLocker > Suspend) to avoid being locked out after the update. Update Procedures
The safest method for this specific legacy model is using a USB flash drive outside of Windows. Method 1: BIOS "Flash System ROM" (Recommended) Format Drive: Format a USB flash drive to FAT32.
Download: Obtain the SoftPaq sp73863 from the HP Software and Driver Downloads page.
Extract Files: Run the .exe and look for the DOS Flash directory. Copy its contents (specifically the .bin file) to the root of your USB drive. Execute Flash: Restart and tap F10 repeatedly to enter Setup. Go to the File menu and select Flash System ROM.
Select the USB drive and follow the on-screen prompts to apply the image. Method 2: HP Support Assistant (Windows) BIOS UPDATE - HP Support Community - 6350097
On that model it is very easy to do. * Get a USB flash drive and format it with the FAT 32 file system. * Download and run the v1. HP Support Community
To update the BIOS for the HP Compaq dc5800 Small Form Factor (SFF) hp compaq dc5800 small form factor bios update verified
, the most reliable and verified method is using a USB flash drive through the F10 Setup menu. Core Update Process (F10 Flash Method)
This method is widely recommended by the HP Support Community to avoid issues often encountered when updating within a Windows environment. Prepare the USB Drive: Format a reliable USB flash drive to FAT32.
Download the latest BIOS (verified as v01.60) from the HP Support Page.
Run the downloaded file to extract the contents. Locate the DOS Flash folder.
Copy only the individual files (e.g., XXX_MMmm.bin) from the DOS Flash folder directly to the root of the USB drive—do not copy the folder itself. Execute the Update:
Insert the USB drive into the dc5800 SFF and restart the computer.
Tap F10 repeatedly at the HP welcome screen to enter the Computer Setup (F10) Utility. Go to the File tab and select Flash System ROM.
Select the USB flash drive when prompted. The utility should automatically detect the .bin update files.
Follow the on-screen instructions to finish the flash. Do not turn off the power during this process. Verification and Troubleshooting The latest verified BIOS version for the HP
Check Success: After the update and reboot, enter the BIOS again (F10) to verify that the version now shows as v01.60.
Failsafe Mode: If a BIOS update fails or the image is invalid, the system includes a failsafe Boot Block BIOS. In this state, the power LED will blink red 8 times and the system will automatically search removable media for a valid BIOS image to restore.
BIOS Settings: Updates may reset customized settings. Review your storage and power configurations in the F10 menu after a successful flash. Other Verified Methods UPDATE Your HP DC5800 BIOS Now made easy
Verified: HP Compaq dc5800 Small Form Factor BIOS Update
I recently had the need to update the BIOS on my HP Compaq dc5800 Small Form Factor PC. After searching through various HP support pages and forums, I was able to successfully update the BIOS to the latest version.
The Update:
The current BIOS version for the HP Compaq dc5800 Small Form Factor is 786G.0A.
Download and Installation:
You can download the BIOS update from the HP Support website: Go to the HP Support website
08045889335 
sp78771.exe).Update Process:
To update the BIOS, simply run the downloaded executable file and follow the on-screen instructions. The update process is relatively straightforward and takes about 5-10 minutes to complete.
Verification:
After updating the BIOS, I verified that the new version was successfully installed:
Notes:
Sources:
Real-world community testing has confirmed these limitations remain:
If your current Windows installation is crashing, use a bootable USB:
SP46935.exe using 7-Zip (right-click → Extract to folder).Flash.bat and .bin ROM file) to the USB.Flash.bat, and press Enter.lsblk. The full 2TB should appear (old BIOS caps at 1TB).
