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 For IT teams, understanding device firmware and how firmware updates work is important because outdated or vulnerable firmware can affect endpoint security, system reliability, hardware compatibility, and operational continuity.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.
What Is Device Firmware?
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:
- BIOS and UEFI firmware
- Router firmware
- Printer firmware
- SSD firmware
- Storage controller firmware
- Server firmware
- Network switch firmware
- Embedded device firmware
- IoT device firmware
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.
How Device Firmware Works
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:
- Device startup
- Hardware initialization
- Input and output control
- Communication protocols
- Security functions
- Device-specific operations
- Power management
- Hardware monitoring
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.
Device Firmware vs Software
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:
- Windows
- Microsoft Office
- Browsers
- Security tools
- Productivity applications
Firmware examples include:
- BIOS or UEFI
- Router operating firmware
- Printer control firmware
- SSD firmware
- Embedded controller firmware
Firmware differs from software because it:
- Runs closer to hardware
- Performs hardware-specific functions
- Often loads before the operating system
- Usually changes less frequently
- May require special update procedures
This distinction matters because firmware maintenance often involves different risks and workflows than normal software patching.
Why Device Firmware Matters
Firmware may operate quietly in the background, but it affects many critical IT functions.
Firmware influences:
- Startup behavior
- Device security
- Hardware compatibility
- Reliability
- Network communication
- Performance
- Recovery capabilities
- Operating system support
Firmware problems can create serious operational issues.
Examples include:
- Devices failing to boot
- Hardware instability
- Security vulnerabilities
- Failed OS upgrades
- Network disruptions
- Peripheral malfunction
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.
Common Devices That Use Firmware
Many organizations manage more firmware than they realize.
Firmware exists across multiple device categories.
Computer Firmware
Most laptops and desktops use BIOS or UEFI firmware.
This firmware handles:
- Startup
- Boot order
- Secure Boot
- TPM interaction
- Hardware initialization
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.
Network Device Firmware
Routers, switches, and firewalls depend heavily on firmware.
Firmware controls:
- Traffic routing
- Network protocols
- Security controls
- Interface functionality
Outdated network firmware may expose security vulnerabilities.
Printer Firmware
Printers and multifunction devices also use firmware.
Updates may address:
- Stability problems
- Security flaws
- Driver compatibility
- Performance issues
Storage Firmware
Storage devices rely on firmware for internal operation.
Examples include:
- SSD firmware
- RAID controller firmware
- Storage appliance firmware
Firmware updates may improve reliability and performance.
Server Firmware
Servers often contain multiple firmware layers.
These may include:
- Motherboard firmware
- BMC firmware
- Storage firmware
- Network adapter firmware
Server firmware management is especially important because updates may affect uptime and business operations.
IoT and Embedded Firmware
Many smart devices and embedded systems rely on firmware.
Examples include:
- Cameras
- Sensors
- Industrial systems
- Medical devices
- Building systems
These devices may be difficult to update and often become overlooked security risks.
What Is a Firmware Update?
A firmware update is a manufacturer-provided update that changes or improves device firmware.
Firmware updates may address:
- Security vulnerabilities
- Stability issues
- Hardware support
- Performance problems
- Feature enhancements
- Compatibility fixes
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.
Why Firmware Updates Are Important
Firmware updates matter because vulnerabilities and hardware issues continue to evolve.
Firmware updates may:
- Fix security flaws
- Support new operating systems
- Improve hardware compatibility
- Stabilize devices
- Extend hardware life
- Address vendor-discovered bugs
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.
How Device Firmware Is Updated
Firmware update methods vary depending on the manufacturer and device type.
However, most updates follow similar steps.
Identify Device and Firmware Version
The first step is identifying:
- Device model
- Manufacturer
- Existing firmware version
This ensures the correct firmware package is used.
Applying incorrect firmware may cause failure.
Review Vendor Guidance
Firmware updates should be reviewed carefully.
IT teams should examine:
- Release notes
- Security advisories
- Compatibility requirements
- Update instructions
- Known limitations
Vendor documentation helps reduce update risk.
Backup and Prepare
Some firmware updates may affect device settings or require downtime.
Preparation may include:
- Configuration backups
- Maintenance scheduling
- Power verification
- Recovery planning
Stable power is particularly important for firmware flashing.
Install the Firmware Update
Firmware updates may be delivered through:
- Vendor utilities
- BIOS or UEFI tools
- Management consoles
- Operating system update packages
- Network management platforms
Installation methods vary by hardware.
Restart and Validate
Many firmware updates require rebooting.
After installation, IT teams should verify:
- Successful installation
- Firmware version
- Device stability
- Configuration integrity
- Security settings
Verification helps confirm that updates succeeded without introducing problems.
Risks of Firmware Updates
Firmware updates provide benefits but also carry risk.
Common firmware update risks include:
Power Failure
Loss of power during firmware flashing may corrupt firmware.
Wrong Firmware Package
Applying firmware for the wrong model may damage functionality.
Configuration Reset
Some firmware updates reset settings.
This may affect:
- Boot order
- Security controls
- Networking
- Performance settings
Compatibility Problems
Updates occasionally create unexpected hardware or software conflicts.
Downtime
Firmware updates may require:
- Restarts
- Maintenance windows
- Temporary service interruption
Because of these risks, firmware updates should be tested and staged.
Firmware Update Best Practices
Effective firmware updates follow repeatable processes.
Recommended practices include:
Maintain Firmware Inventory
Track firmware versions across devices.
This supports visibility and planning.
Prioritize Security Updates
Firmware fixing known vulnerabilities should receive higher priority.
CISA maintains a Known Exploited Vulnerabilities catalog to help organizations identify actively exploited issues.
Test Before Broad Deployment
Pilot testing reduces organization-wide risk.
Use Vendor-Supported Methods
Manufacturer-approved tools reduce compatibility problems.
Document Firmware Changes
Documentation should include:
- Device model
- Previous version
- New version
- Update date
- Known issues
- Recovery details
Maintain Recovery Plans
Recovery planning is essential.
IT teams should understand:
- Rollback procedures
- Recovery modes
- Vendor support paths
- Replacement options
Firmware Security and Modern IT Operations
Firmware security increasingly affects modern IT environments.
Firmware vulnerabilities may bypass traditional software defenses.
Threats targeting firmware may:
- Persist below the OS
- Interfere with Secure Boot
- Evade detection
- Affect startup integrity
NIST emphasizes protecting, detecting, and recovering from firmware compromise.
Firmware should therefore be included in broader cybersecurity and operational planning.
How Device Firmware Connects to Endpoint Management
Firmware visibility is closely connected to endpoint management.
IT teams often need visibility into:
- Device inventory
- Firmware versions
- Patch status
- Hardware readiness
- Security posture
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.
FAQ
What is device firmware?
Device firmware is embedded software that controls hardware functions and device behavior.
Is firmware the same as software?
Firmware is a type of software, but it operates closer to hardware and often loads before the operating system.
Why are firmware updates important?
Firmware updates improve security, stability, compatibility, and hardware reliability.
Can firmware updates fail?
Yes. Power loss, incorrect firmware packages, or compatibility problems may cause update failure.
How often should firmware be updated?
Firmware should be reviewed regularly and updated when vendors release important security or stability improvements.
Summary
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.