Unlike updating a driver, a botched BIOS update can turn your dc5800 into a paperweight. Follow these precautions:
HP releases BIOS updates to correct bugs, add hardware support, and patch security vulnerabilities. For the dc5800, common reasons to update include:
Early BIOS versions cannot boot from or recognize hard drives larger than 2.1TB due to legacy INT13h limitations. BIOS v1.32 and above include improved LBA (Logical Block Addressing) support for 3TB drives. hp compaq dc5800 small form factor bios update
Do not guess. Flashing the wrong ROM can brick your system. The dc5800 SFF is distinct from the Tower (MT) and Convertible Minitower (CMT) variants, though they share similar BIOS files.
Use this if your Windows is corrupt or you are running Linux. Unlike updating a driver, a botched BIOS update
You have three safe methods. Choose based on your current OS.
Once the update is complete, the computer will restart. It is standard practice to reset the BIOS to defaults after a flash update: BIOS v1
Q: Can I update from version 1.00 directly to 1.35? A: Yes. The dc5800 BIOS uses a cumulative update model. There are no intermediate required versions.
Q: Will this update enable UEFI boot? A: No. The Q35 chipset has a legacy BIOS, not UEFI. You will always boot via MBR, not GPT. However, the update improves GPT disk data access.
Q: Does this support Windows 11? A: Officially, no. The dc5800 lacks TPM 2.0 and Secure Boot. Unofficially, BIOS 1.35 allows Windows 11 to install via registry bypasses.
Q: My BIOS update says "Machine is not in a flashable state."
A: This occurs if the BIOS is write-protected. Disable BIOS Write Protection inside the BIOS security settings before flashing.