The keyboard works in Windows but not in BIOS usually because the system supports the hardware differently before the operating system loads. First check the BIOS/UEFI settings to make sure that “USB Legacy Support” or similar options are enabled; if you cannot use the keyboard to navigate the BIOS menu, you can try using the PS/2 keyboard. Second, try plugging the keyboard into the rear I/O port on the motherboard, avoiding the USB 3.0 port, and testing other keyboards that are known to work in the BIOS environment. Next, consider updating or resetting the BIOS/UEFI firmware, visit the motherboard manufacturer's website to download the latest BIOS version and follow the instructions, or select "Load Setup Defaults" to restore the default settings. Finally, enable XHCI mode to support USB 3.0 keyboard: Go to BIOS settings, find the USB configuration section, set XHCI mode to enable, save and exit. The problem can be solved by adjusting the BIOS settings, replacing the USB port or updating the firmware. Although it requires some attempt, it is not complicated.

If your keyboard works in Windows but not in BIOS, it's usually due to how the system handles hardware before the OS loads. The good news is, this issue is often fixed without needing new hardware.

Check BIOS/UEFI Settings First

One of the most common reasons a keyboard isn't working in BIOS is that USB support isn't enabled or configured properly. Some motherboards disable USB devices during boot unless explicitly told not to.

• Look for an option like "USB Legacy Support" , "Legacy USB Support" , or "XHCI Hand-off"
• Make sure these options are set to Enabled
• If you can't navigate the BIOS menu with your keyboard, try using a PS/2 keyboard if available

Keep in mind, the exact name and location of these settings vary by motherboard manufacturer.

Use a Different USB Port or Try a Different Keyboard

Not all USB ports are treated equally in BIOS. Front panel or hub-connected ports might not get power or recognition early in the boot process.

Try the following:

• Plug the keyboard into a rear I/O port directly on the motherboard
• Avoid USB 3.0 ports if possible — some older BIOS versions have trouble with them
• Test with a different keyboard, especially one known to work in BIOS environments

Wired keyboards tend to be more reliable than wireless ones in BIOS, since some dongles or Bluetooth modules aren't initialized until Windows starts.

Update or Reset BIOS/UEFI Firmware

Sometimes, the problem comes from outdated or misconfigured firmware.

To address this:

• Check your motherboard manufacturer's website for a BIOS update
• Follow their instructions carefully — incorrect flashing can brick your board
• Alternatively, try resetting BIOS settings to default (look for a "Load Setup Defaults" option)

Updating the BIOS can resolve compatibility issues with newer hardware, including USB controllers and input devices.

Enable XHCI Mode in BIOS (for USB 3.0 Keyboards)

Some systems use XHCI mode for USB 3.0 support, which may not be active by default in BIOS.

• Go into BIOS settings
• Navigate to the USB Configuration section
• Set XHCI Mode to Enabled
• Save and exit

This change allows better USB 3.0 support during early boot stages, which can make your keyboard functional in BIOS again.

Basically, start with the BIOS settings and USB ports, then test with another keyboard or update the firmware if needed. It's not complicated, but it does require a bit of trial and error.

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