A Dell Latitude E5400 laptop is an excellent laptop, but many users reported that they can’t seem to unlock their BIOS.
Booting into BIOS allows you to set system security settings.
If this issue keeps occurring, there are a few troubleshooting steps you can try.
- The Dell Latitude E5400 laptop has a dedicated website where you can find drivers and BIOS updates.
- The Dell Latitude E5400 laptop has a BIOS lock feature that you can use to prevent others from accessing it.
- To unlock the Dell Latitude E5400 laptop BIOS, you should run the Command prompt.
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Disconnect the SSD drive
- Disconnect the SATA cable from the SATA connector
Disconnect all external peripherals
Disconnect the battery
Disconnect the AC adapter - Remove the CMOS battery
- Press and hold down the power button
- Hold the Power button for 15 seconds
- Disconnect the AC adapter
- Disconnect the battery
- Disconnect all external peripherals
- Remove the CMOS battery
- Replace the battery
- Reconnect the battery
- Reconnect the AC adapter
- Reconnect the SATA cable
- Reconnect the SSD drive
- Reconnect the external peripherals
- Press and hold down the power button
- Press and hold down the power button again
- Disconnect the AC adapter
- Connect the AC adapter
Run the BIOS Update option
- Press the F2 or Del key while booting the system
- Select Security option
- Select the Trusted Platform Module (TPM) password
- Type in your password
- Re-enter the password
- Press F10 to save changes
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Clear the BIOS update cache
- Press the Power button of your laptop.
- Hold down the “Shift” button while powering on the laptop.
- Release the “Shift” button when the message “Clearing the BIOS update cache” appears on the screen.
- Restart the computer.
Change the SATA controller mode
- Press the Windows key + I to open Settings, and select Update & Security.
- Click the Recovery tab on the Settings window.
- Select the Restart now under Advanced startup.
- Now select the Troubleshoot option, and select the Advanced options under Startup settings.
- Click Restart.
- On the Advanced Options screen, select UEFI Firmware Settings.
- Change the SATA controller mode from AHCI to IDE.
Reset the BIOS update settings
- Press the F2 key while the computer is booting.
- Press the Esc key while holding down the F2 key.
- Press and hold the F9 key while the computer is restarting.
- Press the Esc key 2 times to exit the BIOS page.
Change SATA controller mode
- Press the Windows key + S, enter device manager, select the first search result, and click Run as administrator.
- In the Device Manager window, expand the SATA Controllers entry.
- Right-click on the SATA Controller and select Properties.
- Go to the Power Management tab.
- Select the Power Management Mode from the drop-down menu.
- Select “Disabled” from the drop-down menu (if it isn’t already).
- Click Apply and OK to save changes.
