Server Firmware & BIOS Updates: Why They Matter Before Deployment (2026)

A server can boot fine, pass a basic stress test, and still be running BIOS or firmware that's several years out of date. Firmware is the layer beneath the operating system — it's what actually talks to the CPU, memory, storage controller and out-of-band management chip — and letting it sit outdated is one of the most overlooked risks in deploying any server, new or refurbished.

What counts as "firmware" on a server

Firmware isn't one thing — it's several independent pieces, each versioned and updated separately: the system BIOS/UEFI, the RAID or HBA controller firmware, drive firmware (HDD/SSD/NVMe), network adapter firmware, and the out-of-band management controller (iLO, iDRAC or IPMI — see our iLO vs iDRAC vs IPMI guide). A server can have current BIOS but an old RAID controller firmware, or vice versa — checking one doesn't confirm the others.

Why outdated firmware is a real risk, not just a formality

• Security — manufacturers regularly patch firmware-level vulnerabilities (the kind that sit below the OS and antivirus can't see). An unpatched BIOS or management controller is a genuine attack surface, not a theoretical one.
• Compatibility — newer CPUs, larger-capacity drives, and some RAM configurations often need a minimum BIOS version to be recognized correctly. A server refusing to see a drive's full capacity is sometimes a firmware issue, not a hardware fault.
• Stability — RAID controller and drive firmware updates frequently fix specific data-integrity or unexpected-reboot bugs that manufacturers document but don't always publicize loudly.

Firmware on a refurbished server specifically

A refurbished server that's been sitting in inventory for months can easily be several firmware revisions behind what the manufacturer currently ships — this is normal and not a sign of a badly maintained unit, but it does mean a buyer shouldn't assume "it's tested and working" also means "it's current." Ask specifically whether firmware and BIOS were updated as part of the testing process, not just whether the unit powers on and passes diagnostics.

Practical approach before going live

• Check BIOS/UEFI, RAID controller, drive and NIC firmware versions against the manufacturer's current release before deploying — each vendor's support portal lists current versions by model.
• Update in the vendor-recommended order (typically out-of-band controller first, then BIOS, then peripheral firmware) — updating out of order on some platforms causes update failures.
• Re-verify RAID configuration and boot order after a firmware update — some updates reset controller settings to default.

Every server we sell is tested and shipped with current firmware and BIOS as part of our 72-point testing process, not left at whatever revision it arrived with. Browse current refurbished servers or ask about ongoing firmware and hardware upkeep under our AMC plans.