Updating your BIOS can fix boot issues, improve hardware compatibility, and resolve security vulnerabilities — but it must be done correctly. This guide covers the exact steps for the four most common laptop brands, plus what to do if something goes wrong.
⚠️ Important: Never interrupt a BIOS update. Keep the laptop plugged in throughout the entire process. A failed BIOS update can render the laptop unbootable.
Before You Start — For All Brands
- Note your current BIOS version: press Win+R, type
msinfo32, look for BIOS Version/Date - Find your exact laptop model number: on the sticker on the base of the laptop
- Plug in the charger — do not rely on battery
- Close all applications before starting
How to Update ASUS BIOS
Method 1: ASUS EZ Flash (Recommended)
- Go to asus.com/support and enter your model number
- Download the latest BIOS file and extract the .CAP file to a FAT32 USB drive
- Restart the laptop and enter BIOS (press F2 at startup)
- Go to Advanced → ASUS EZ Flash 3 Utility
- Select the USB drive and choose the .CAP file
- Confirm and wait for the update to complete — the laptop will restart automatically
Method 2: WinFlash (within Windows)
- Download the WinFlash utility from asus.com alongside the BIOS file
- Run WinFlash and point it to the downloaded BIOS file
- Click Start Flash — do not touch the laptop until complete
How to Update HP BIOS
Method 1: HP Support Assistant (Easiest)
- Open HP Support Assistant (pre-installed on most HP laptops)
- Click Updates — if a BIOS update is available, it will appear here
- Click Install and follow the prompts
Method 2: USB Recovery Flash
- Download the BIOS .exe from support.hp.com using your Service Tag
- Run the .exe — it creates a bootable USB automatically
- Boot from the USB and follow the on-screen instructions
How to Update Dell BIOS
- Open SupportAssist (pre-installed) or go to dell.com/support
- Enter your Service Tag (found on the base sticker)
- Under Drivers & Downloads → Category: BIOS
- Download the latest BIOS .exe file
- Run it as administrator — Dell handles the rest automatically
- The laptop will restart several times during the update
Dell’s process is the simplest — it’s fully automated once you run the downloaded file.
How to Update Lenovo BIOS
Method 1: Lenovo Vantage (Recommended)
- Open Lenovo Vantage from the Start menu
- Go to Device → System Update
- Click Check for Updates — BIOS updates appear under Critical Updates
- Install and follow the prompts
Method 2: Manual Update
- Go to support.lenovo.com and enter your model number
- Under Drivers & Software → BIOS/UEFI
- Download and run the update package as administrator
What If the BIOS Update Fails?
Most modern laptops have a BIOS recovery mechanism:
- ASUS: Hold Alt+F2 at startup with a USB containing the .CAP file
- HP: Hold Win+B at startup for USB BIOS recovery
- Dell: The recovery is automatic from the second BIOS chip built into the laptop
- Lenovo: Hold Fn+R at startup for ThinkPad BIOS recovery
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Frequently Asked Questions
Do I need to update my BIOS?
Only update your BIOS if you’re experiencing a specific issue it addresses — such as compatibility with new RAM, a boot loop, or a security patch. There’s no benefit to updating a BIOS that’s working fine.
How long does a BIOS update take?
Typically 3–10 minutes. The laptop will restart at least once. Do not interrupt it during this time.
Can a BIOS update brick my laptop?
A power cut during the update can cause a failed flash, but most modern laptops have a dual-BIOS or recovery mechanism. Following the steps above and keeping the laptop plugged in makes a failed update very unlikely.
