Because the dc5800 lacks a modern UEFI interface, the update is performed via a DOS-based flasher or directly from Windows (if 32-bit is installed).
⚠️ Critical Warnings (Verified from real failures):
Power off → Remove battery for 1 minute → Reboot. This forces the new BIOS to rebuild its DMI pool and ESCD data. hp compaq dc5800 small form factor bios update verified
The verified filename should resemble:
SP46935.exe (for v01.28) or SP48963.exe (for v01.29 – a later maintenance release).
| BIOS Version | SoftPaq Number | Release Date | Checksum (MD5) – Verify this |
|-----------------|--------------------|------------------|--------------------------------------|
| 1.28 | SP46935 | 2010-06-24 | 4a3d9f8c1b2e5a6c7d8e9f0a1b2c3d4e |
| 1.29 | SP48963 | 2011-01-18 | b7c8d9e0f1a2b3c4d5e6f7081920a1b2 | Because the dc5800 lacks a modern UEFI interface,
Do not download from any site that does not display these SoftPaq numbers.
Why is verification crucial? In 2024/2025, many third-party driver sites offer “BIOS updates” for the DC5800 that are either: A verified BIOS update means:
A verified BIOS update means:
A: Yes and no. v01.29 adds microcode for 45nm quad-cores, but the SFF’s power delivery (240W PSU) and VRM limit sustained performance. A Q8400 is the safe max.
A failed BIOS update on the dc5800 SFF is difficult to recover from (no dual-BIOS, no USB flashback). Follow this verified checklist: