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Device firmware is embedded software that controls hardware behavior and startup processes. This guide explains how firmware works, how firmware updates are performed, and why firmware maintenance matters for IT teams.
Level
Friday, April 10, 2026
Device firmware is low-level software embedded into hardware that controls how a device starts, communicates, and performs core functions. Unlike regular software applications, firmware operates closer to the hardware and often runs before the operating system loads. Device firmware updates help improve security, fix bugs, support new hardware features, and maintain device stability. For IT teams, understanding device firmware and how firmware updates work is important because outdated or vulnerable firmware can affect endpoint security, system reliability, hardware compatibility, and operational continuity. NIST describes platform firmware as a foundational component needed to boot and operate a system and emphasizes firmware protection and resiliency as key security priorities.
Firmware is software permanently or semi-permanently stored inside hardware devices.
It provides the instructions hardware needs to function properly.
Unlike operating systems or applications, firmware interacts directly with device hardware and usually performs specialized control functions.
Common examples of firmware include:
Firmware often starts before the operating system.
For example, BIOS or UEFI firmware initializes hardware and prepares a computer to load Windows or Linux.
Lenovo describes BIOS as the first software that runs during startup and explains that it identifies, tests, and configures hardware before handing control to the operating system.
Without firmware, most modern devices would not function.
Firmware is therefore a core part of hardware operation.
Firmware acts as a bridge between hardware and higher-level software.
It tells hardware how to behave and how to communicate with the operating system or applications.
Although firmware varies by device type, the process generally follows similar principles.
Firmware commonly handles:
For example:
A laptop firmware initializes memory, storage, and processors.
A router firmware controls networking and traffic routing.
A printer firmware manages printing functions and communication with connected systems.
A storage controller firmware coordinates data access and storage behavior.
Because firmware operates at such a low level, problems at the firmware layer may affect device behavior before normal software tools can respond.
Firmware and software are related but not identical.
Software typically refers to programs and operating systems installed on devices.
Firmware refers to embedded software controlling hardware.
Software examples include:
Firmware examples include:
Firmware differs from software because it:
This distinction matters because firmware maintenance often involves different risks and workflows than normal software patching.
Firmware may operate quietly in the background, but it affects many critical IT functions.
Firmware influences:
Firmware problems can create serious operational issues.
Examples include:
NIST explains that firmware occupies a privileged position within computing systems and therefore represents an important security boundary.
For IT teams, firmware management is part of maintaining operational stability.
Many organizations manage more firmware than they realize.
Firmware exists across multiple device categories.
Most laptops and desktops use BIOS or UEFI firmware.
This firmware handles:
Modern Windows devices increasingly rely on UEFI firmware and Secure Boot.
Microsoft describes Secure Boot as a security standard that helps ensure only trusted software loads during startup.
Routers, switches, and firewalls depend heavily on firmware.
Firmware controls:
Outdated network firmware may expose security vulnerabilities.
Printers and multifunction devices also use firmware.
Updates may address:
Storage devices rely on firmware for internal operation.
Examples include:
Firmware updates may improve reliability and performance.
Servers often contain multiple firmware layers.
These may include:
Server firmware management is especially important because updates may affect uptime and business operations.
Many smart devices and embedded systems rely on firmware.
Examples include:
These devices may be difficult to update and often become overlooked security risks.
A firmware update is a manufacturer-provided update that changes or improves device firmware.
Firmware updates may address:
Firmware updates differ from ordinary software updates because they directly affect device hardware behavior.
This creates both value and risk.
Dell explains that BIOS and firmware updates may improve performance, stability, and compatibility while resolving known problems.
For IT teams, firmware updates are part of preventive maintenance and security management.
Firmware updates matter because vulnerabilities and hardware issues continue to evolve.
Firmware updates may:
Firmware vulnerabilities have become increasingly important in cybersecurity.
NIST SP 800-193 focuses on firmware resiliency because attacks targeting firmware may interfere with platform startup and integrity.
Recent Secure Boot certificate transitions also highlight the need for active firmware maintenance.
Microsoft explains that older Secure Boot certificates begin expiring in 2026 and some systems require updates to maintain trusted startup behavior.
Firmware updates are therefore not optional housekeeping.
They are often part of security and operational continuity.
Firmware update methods vary depending on the manufacturer and device type.
However, most updates follow similar steps.
The first step is identifying:
This ensures the correct firmware package is used.
Applying incorrect firmware may cause failure.
Firmware updates should be reviewed carefully.
IT teams should examine:
Vendor documentation helps reduce update risk.
Some firmware updates may affect device settings or require downtime.
Preparation may include:
Stable power is particularly important for firmware flashing.
Firmware updates may be delivered through:
Installation methods vary by hardware.
Many firmware updates require rebooting.
After installation, IT teams should verify:
Verification helps confirm that updates succeeded without introducing problems.
Firmware updates provide benefits but also carry risk.
Common firmware update risks include:
Loss of power during firmware flashing may corrupt firmware.
Applying firmware for the wrong model may damage functionality.
Some firmware updates reset settings.
This may affect:
Updates occasionally create unexpected hardware or software conflicts.
Firmware updates may require:
Because of these risks, firmware updates should be tested and staged.
Effective firmware updates follow repeatable processes.
Recommended practices include:
Track firmware versions across devices.
This supports visibility and planning.
Firmware fixing known vulnerabilities should receive higher priority.
CISA maintains a Known Exploited Vulnerabilities catalog to help organizations identify actively exploited issues.
Pilot testing reduces organization-wide risk.
Manufacturer-approved tools reduce compatibility problems.
Documentation should include:
Recovery planning is essential.
IT teams should understand:
Firmware security increasingly affects modern IT environments.
Firmware vulnerabilities may bypass traditional software defenses.
Threats targeting firmware may:
NIST emphasizes protecting, detecting, and recovering from firmware compromise.
Firmware should therefore be included in broader cybersecurity and operational planning.
Firmware visibility is closely connected to endpoint management.
IT teams often need visibility into:
Firmware issues rarely exist in isolation.
They often connect to broader workflows involving device monitoring, patch coordination, IT asset management, and hardware lifecycle planning.
Level helps IT teams manage endpoints through centralized visibility and automation. While firmware itself operates below the operating system, firmware-related tasks often intersect with endpoint management, remote monitoring, patch management, and operational consistency across distributed devices.
Connecting firmware awareness with broader endpoint management may help teams reduce manual effort and maintain healthier device fleets.
Device firmware is embedded software that controls hardware functions and device behavior.
Firmware is a type of software, but it operates closer to hardware and often loads before the operating system.
Firmware updates improve security, stability, compatibility, and hardware reliability.
Yes. Power loss, incorrect firmware packages, or compatibility problems may cause update failure.
Firmware should be reviewed regularly and updated when vendors release important security or stability improvements.
Device firmware is embedded software that controls how hardware operates and communicates. It plays an essential role in startup, security, performance, and device functionality.
Firmware updates help maintain secure and reliable systems by addressing vulnerabilities, improving compatibility, and fixing operational problems. For IT teams, understanding device firmware and following structured firmware update practices supports stronger endpoint security, better operational consistency, and healthier hardware environments.
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