This chapter covers BIOS/UEFI update procedures, a critical hardware maintenance task for the CompTIA A+ 220-1101 exam. Understanding when and how to update firmware is essential for system stability, security, and compatibility. Expect 1-2 questions on this topic in the exam, focusing on preparation steps, risks, and correct procedures.
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Think of a ship's navigation computer as the BIOS/UEFI. It controls the ship's steering, engine startup, and communication systems. Updating this computer is like performing a BIOS/UEFI update. First, you must ensure the ship is docked (connected to a stable power source) because if the battery dies mid-update, the computer could be bricked. You download the new navigation software from the manufacturer's secure website and copy it to a USB drive (the update media). Before starting, you verify the software's checksum to ensure it hasn't been corrupted or tampered with. Then, you plug the USB into the ship's console and initiate the update. The computer erases the old navigation program and writes the new one. This is the most critical phase: if the power fails or the USB is removed, the computer is left with no navigation software and the ship cannot steer. After writing, the computer verifies the new software's integrity. Finally, it restarts and calibrates the new navigation system. The ship is now updated with improved routes and safety features. Just like a BIOS/UEFI update, the process requires careful preparation, a stable power source, and patience; any interruption can render the system unusable.
BIOS (Basic Input/Output System) and UEFI (Unified Extensible Firmware Interface) are firmware interfaces that initialize hardware during the boot process and provide runtime services for the operating system. UEFI is the modern replacement for BIOS, offering a graphical interface, support for drives larger than 2.2 TB, and faster boot times. Firmware updates, often called "flashing," are released by motherboard manufacturers to fix bugs, patch security vulnerabilities, add support for new hardware (e.g., CPUs, RAM), or improve system stability.
When to Update – The Exam's Focus
The 220-1101 exam emphasizes that BIOS/UEFI updates should only be performed when necessary. Common reasons include: - Security patches: Mitigate vulnerabilities like Spectre or Meltdown. - Hardware compatibility: Enable support for a new CPU or higher RAM speed. - Bug fixes: Resolve issues like incorrect temperature readings or boot failures. - Feature updates: Add support for newer technologies (e.g., NVMe drives).
Crucially, the exam stresses that you should NOT update if the system is working correctly. Unnecessary updates introduce risk. The mantra is: "If it ain't broke, don't fix it."
Pre-Update Steps – The Mechanism
Before flashing, you must take specific precautions to avoid bricking the motherboard:
Identify the current firmware version: Boot into the BIOS/UEFI setup utility (typically by pressing Del, F2, F10, or Esc during startup). Note the version number. Alternatively, use Windows System Information (msinfo32) to see the BIOS version/date.
Check the manufacturer's website: Navigate to the support page for your exact motherboard model. Download the latest BIOS/UEFI version. Never use a beta version on a production system; only use stable releases.
Read the release notes: Understand what the update fixes and any special instructions (e.g., you may need to update to an intermediate version first).
Back up current firmware: Some tools allow saving a backup of the current BIOS/UEFI. This can be used to revert if the new version causes issues.
Ensure a stable power source: Connect the system to a UPS (Uninterruptible Power Supply). A power loss during flashing can corrupt the firmware.
Close all applications: Do not run any other programs during the update.
Prepare the update media: Most updates are applied via a USB flash drive formatted as FAT32. Copy the downloaded firmware file to the drive. Some manufacturers provide a Windows-based flashing utility, but the USB method is more reliable.
The Update Process – Step by Step
There are three primary methods to update BIOS/UEFI:
USB Flashback: Many modern motherboards allow updating via a dedicated USB port with a button on the I/O panel. This method does not require a CPU or RAM installed. You plug in the USB with the firmware file and press the button. The motherboard reads the file and flashes automatically.
BIOS/UEFI Built-in Flasher: Boot into the UEFI setup and use the built-in update tool (e.g., ASUS EZ Flash, Gigabyte Q-Flash, MSI M-Flash). Select the firmware file from the USB drive and confirm. The system will reboot and flash.
Windows-based Utility: Some manufacturers provide a tool that runs in Windows (e.g., ASUS AI Suite, MSI Live Update). This is convenient but riskier because Windows may crash or interrupt the process. The exam generally prefers the USB method or built-in flasher.
Verification and Post-Update Steps
After flashing, the system will typically reboot automatically. You should:
Enter BIOS/UEFI setup and load default settings (or optimized defaults). This resets any custom settings that may conflict with the new firmware.
Verify the new version is installed.
Reconfigure any custom settings such as boot order, XMP profiles, or fan curves.
Test system stability by booting into the OS and running normal tasks.
Risks and Failure Recovery
If a firmware update fails or the system becomes unbootable (bricked), recovery options include:
BIOS Recovery: Some motherboards have a recovery mode. You can press a key combination (e.g., Ctrl+Home) or use a jumper to force recovery from a backup or a USB drive.
Dual BIOS: Higher-end boards have a backup BIOS chip. You can switch to the backup via a jumper or switch.
Flashback: If the motherboard supports USB Flashback, you can reflash even if the system is unbootable.
RMA: If all else fails, the motherboard may need to be replaced.
Specific Exam Traps
Power is the #1 risk: The exam will always emphasize using a UPS. A power outage during flashing is catastrophic.
Wrong firmware: Flashing with firmware for a different motherboard model can cause immediate failure. Always verify the model number.
Interrupting the process: Never turn off or reset the system during flashing. The exam may present a scenario where a technician starts the update and then walks away, only to have the power cord accidentally kicked out.
Skipping backup: While not always possible, backing up the current firmware can save you if the new version has issues.
Interaction with Related Technologies
TPM (Trusted Platform Module): Firmware updates may reset TPM settings, causing BitLocker to ask for recovery keys. Always have recovery keys available.
Secure Boot: Updates may change Secure Boot keys or disable it. You may need to re-enable Secure Boot after updating.
Boot order: Firmware updates often reset boot order to default. If you have multiple drives, you may need to reconfigure.
Command and Configuration Examples
- To check BIOS version in Windows:
wmic bios get smbiosbiosversionOr using PowerShell:
Get-WmiObject Win32_BIOS | Select-Object SMBIOSBIOSVersion- To update via UEFI shell (rare):
shell> fs0:
fs0:> flash.nshKey Values and Defaults
FAT32: The required filesystem for USB update media. The file size limit is 4 GB, which is sufficient for firmware files.
Stable power: Use a UPS with at least 10 minutes of runtime.
Firmware file extension: Typically .CAP, .ROM, .BIN, or .FD, depending on the manufacturer.
Summary of Exam-Relevant Points
Only update when necessary (security, compatibility, bug fix).
Use a UPS to prevent power loss.
Use the correct firmware for your exact motherboard model.
Prefer USB flashback or built-in flasher over Windows utilities.
After update, load optimized defaults and reconfigure settings.
Have a recovery plan (backup, dual BIOS, flashback).
The exam will test your understanding of these steps and common mistakes. Expect scenario-based questions where you must identify the correct procedure or the cause of a failure.
Identify Current Firmware Version
Boot into the BIOS/UEFI setup utility by pressing the appropriate key (Del, F2, F10, etc.) during POST. Look for the BIOS version/date on the main screen. Alternatively, use Windows System Information (msinfo32) or command line: `wmic bios get smbiosbiosversion`. Document the version. This step ensures you know if an update is needed and which version to download. The exam may present a scenario where a technician checks the version and finds it is already the latest, thus avoiding an unnecessary update.
Download Correct Firmware from Manufacturer
Go to the motherboard manufacturer's support website. Enter the exact model number (e.g., ASUS ROG STRIX B550-F GAMING). Download the latest stable BIOS/UEFI version. Read the release notes to understand changes and any prerequisites (e.g., must install an intermediate version first). Never use beta versions on production systems. Verify the file's integrity using checksums (MD5, SHA) provided on the website. This step is critical: installing firmware for a different model can brick the motherboard.
Prepare Update Media
Format a USB flash drive as FAT32 (the standard for UEFI). Copy the downloaded firmware file to the root of the drive. Some manufacturers require the file to be renamed (e.g., ROG.ROM for ASUS). Do not use a USB 3.0 drive if the system only supports USB 2.0 during flashing; use a USB 2.0 port for compatibility. Ensure the drive is not corrupted by scanning it with CHKDSK beforehand. The exam may test that FAT32 is required, and that the file must be on the root, not in a folder.
Connect to Stable Power Source
Plug the computer into a UPS (Uninterruptible Power Supply) to prevent power loss during the update. A power outage or surge during flashing can corrupt the firmware, rendering the motherboard unbootable. If a UPS is unavailable, ensure the system is connected to a reliable power outlet and avoid performing the update during a thunderstorm. The exam emphasizes this as the most important precaution. Also, close all running applications and disable sleep/hibernate settings.
Perform the Firmware Update
Insert the USB drive into a USB port (preferably USB 2.0). Boot into the BIOS/UEFI setup and launch the built-in flashing tool (e.g., ASUS EZ Flash, Gigabyte Q-Flash). Select the firmware file from the USB drive. Confirm the update when prompted. Do not interrupt the process by pressing keys, resetting, or powering off. The system will automatically reboot after completion. If the motherboard supports USB Flashback, you can update without entering BIOS by using a dedicated USB port and button.
Post-Update Verification and Configuration
After the system reboots, enter BIOS/UEFI setup again. The new version should be displayed. Load optimized defaults to clear any old settings that may cause instability. Reconfigure custom settings such as boot order, XMP profiles, fan curves, and Secure Boot. Save and exit. Boot into the operating system and verify that all hardware is recognized correctly. Run system stability tests (e.g., memory test, stress test). If any issues arise, you may need to reinstall drivers or revert to the previous firmware (if backup was made).
Enterprise Deployment Scenarios
Scenario 1: Security Patch Rollout A large corporation with thousands of workstations needs to patch a critical vulnerability in the UEFI firmware (e.g., LogoFAIL). The IT team uses a centralized management tool like Dell Command Update or HP Image Assistant to deploy firmware updates remotely. They first test the update on a small pilot group, then gradually roll out to all systems. They ensure all systems are connected to a UPS and have a backup of the current firmware. If a workstation fails to boot after update, they use the manufacturer's remote BIOS recovery feature (e.g., Dell's BIOS Recovery) to restore from a network share. The scale requires careful scheduling to avoid disrupting productivity, and the team monitors for failures using logs.
Scenario 2: Hardware Refresh Compatibility A data center upgrades servers with new CPUs that require a specific UEFI version. The engineering team downloads the firmware from the server vendor (e.g., Supermicro, Dell PowerEdge) and uses the built-in BMC (Baseboard Management Controller) to flash remotely via IPMI. They first ensure the server is in a maintenance window and all VMs are migrated off. They use the vendor's lifecycle controller to apply the update without needing physical access. After update, they verify the server POSTs correctly and the new CPU is recognized. They also update the BMC firmware separately. Common issues include mismatched firmware versions between server components, which can cause communication failures.
Scenario 3: Recovery from Failed Update A technician at a small business updates the BIOS on a workstation without a UPS. During the flash, a power flicker occurs, and the system becomes unresponsive. The motherboard has dual BIOS, so the technician switches the jumper to the backup BIOS and successfully boots. He then reflashes the primary BIOS from a USB drive using the backup BIOS's flashing tool. If the motherboard didn't have dual BIOS, the technician would have used the manufacturer's USB Flashback feature or sent the board for RMA. This scenario highlights the importance of having a recovery plan.
Performance Considerations: Firmware updates typically take 1-5 minutes. During this time, the system is completely offline. In enterprise environments, updates are often scheduled during off-hours. Some vendors support live updates without rebooting (e.g., Intel's UEFI capsule update), but these are less common. Always ensure the firmware file is not corrupted by verifying its checksum. Misconfiguration after update (e.g., resetting boot order) can cause downtime if not corrected.
220-1101 Exam Focus on BIOS/UEFI Update Procedures
Objective Code: 3.1 (Given a scenario, install or replace the appropriate motherboard components). This objective includes BIOS/UEFI updates as part of motherboard maintenance. The exam expects you to know the correct steps, risks, and troubleshooting.
Common Wrong Answers and Why Candidates Choose Them: 1. "Update the BIOS whenever a new version is available." – Candidates think newer is always better. Reality: Only update if there is a specific need (security, compatibility, bug fix). Unnecessary updates risk bricking the system. 2. "Use a Windows-based utility for convenience." – Candidates choose this because it's easier. Reality: The exam prefers the USB method or built-in flasher because Windows utilities can be interrupted by crashes or driver issues. 3. "Disconnect the power cord to prevent static electricity." – Candidates confuse ESD precautions with update safety. Reality: You must keep the system powered on and connected to a UPS; removing power will brick the system. 4. "Update the BIOS from within the OS using Device Manager." – Candidates confuse driver updates with firmware updates. Reality: Device Manager does not update BIOS; you must use manufacturer-specific tools.
Specific Numbers and Terms That Appear on the Exam: - FAT32: The required filesystem for the USB drive. - UPS: The recommended power protection. - Bricked: Term for a motherboard that is unusable after a failed update. - Flashback: A feature that allows updating without a CPU or RAM. - Dual BIOS: A backup BIOS chip for recovery.
Edge Cases and Exceptions: - UEFI vs Legacy BIOS: The update process is similar, but UEFI firmware files may be larger and require a GPT partition on the USB (though FAT32 is still standard). - Server vs Desktop: Servers often have remote management (BMC, iLO, iDRAC) for firmware updates; the exam focuses on desktop/consumer boards. - Beta versions: Never use beta firmware on production systems. - Intermediate updates: Some manufacturers require updating to an intermediate version before the latest; always read release notes.
How to Eliminate Wrong Answers:
If an answer suggests updating without a specific reason, eliminate it.
If an answer says to use Device Manager or Windows Update, eliminate it.
If an answer says to disconnect power, eliminate it.
If an answer says to update from a network share without a stable power source, eliminate it.
Look for answers that mention verifying the motherboard model, using a UPS, and using the built-in flasher.
Only update BIOS/UEFI when there is a specific need (security, compatibility, bug fix).
Always connect the system to a UPS before updating to prevent power loss.
Use a USB flash drive formatted as FAT32 for the firmware file.
Verify the motherboard model and download the correct firmware from the manufacturer's website.
Prefer the built-in UEFI flasher or USB Flashback over Windows-based utilities.
After update, load optimized defaults and reconfigure custom settings.
Have a recovery plan: backup current firmware, dual BIOS, or flashback capability.
Never interrupt the flashing process; wait for it to complete and reboot.
Check release notes for special instructions (e.g., intermediate updates).
Do not use beta firmware on production systems.
These come up on the exam all the time. Here's how to tell them apart.
USB Flashback
Can update without CPU, RAM, or GPU installed.
Uses a dedicated USB port and button on the I/O panel.
Does not require entering BIOS setup.
Works even if the current firmware is corrupted (recovery).
Supports flashing from a USB drive formatted as FAT32.
Built-in UEFI Flasher
Requires system to POST and enter UEFI setup.
Uses a software tool within the UEFI menu.
Allows you to backup current firmware before flashing.
More user-friendly with graphical interface.
Commonly available on most motherboards.
Mistake
You should update the BIOS/UEFI regularly to keep it current.
Correct
Only update when necessary (security patch, hardware compatibility, bug fix). Unnecessary updates introduce risk of bricking the system without benefit.
Mistake
A Windows-based utility is the safest way to update BIOS/UEFI.
Correct
Windows utilities are riskier because Windows may crash or be interrupted. The safest method is using the built-in flasher from the UEFI setup or USB Flashback.
Mistake
You can update the BIOS by downloading a file and running it in Windows.
Correct
Some manufacturers provide Windows executables that update the BIOS, but they require a reboot into a special environment. The exam emphasizes using the UEFI built-in tool or USB Flashback.
Mistake
If the update fails, you can just restart and try again.
Correct
A failed update often corrupts the firmware, leaving the motherboard unbootable. Recovery requires special features like dual BIOS, flashback, or RMA.
Mistake
You should update the BIOS to the latest beta version for best performance.
Correct
Beta versions are unstable and should never be used on production systems. Only use stable releases from the manufacturer's support page.
Reveal each answer, then mark whether you got it right. Score 60%+ to unlock the next chapter.
BIOS (Basic Input/Output System) is older firmware that uses a 16-bit interface, supports drives up to 2.2 TB, and boots in real mode. UEFI (Unified Extensible Firmware Interface) is modern, 64-bit, supports drives larger than 2.2 TB, offers a graphical interface, and includes features like Secure Boot and faster boot times. Most new systems use UEFI, but the update procedures are similar. The exam may refer to both as firmware updates.
First, try to use motherboard recovery features: check if your board has a dual BIOS (switch to backup via jumper), USB Flashback (use a dedicated port and button), or a recovery jumper. If none are available, you may need to remove the CMOS battery for 10 minutes to reset, but this rarely helps a corrupted firmware. The last resort is to contact the manufacturer for RMA or replace the motherboard. Always have a recovery plan before updating.
Some motherboards support updating via the internet directly from the UEFI (e.g., ASUS EZ Flash 3 can download from the web). However, this requires a working network connection in UEFI. The exam typically focuses on the USB method as the most reliable. Some manufacturers also provide Windows-based utilities, but these are riskier.
No, a BIOS/UEFI update does not affect the operating system directly. However, it may reset some UEFI settings like boot order, Secure Boot keys, or TPM state. You may need to reconfigure these settings, but the OS remains intact. If BitLocker is enabled, have the recovery key handy as the TPM may be reset.
Yes, but it is riskier because laptop batteries can die during the update if not plugged in. Always connect the laptop to AC power and ensure the battery is charged above 50%. Some laptops have a built-in battery that cannot be removed, so a power outage is catastrophic. Use a UPS if possible. Follow the manufacturer's instructions exactly.
You can find it in several ways: check the motherboard itself (printed on the board), use Windows System Information (msinfo32) under 'System Model', use command `wmic baseboard get product,Manufacturer`, or use third-party tools like CPU-Z. The exact model number is crucial for downloading the correct firmware.
Bricked means the motherboard is as useful as a brick—it cannot boot or function. This happens when the firmware is corrupted during an update, often due to power loss or using the wrong firmware. Recovery is difficult and may require specialized hardware or RMA.
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