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A Dell Latitude E6400 with Windows10 and an Intel Core2, 64bit, Bios A11 processor. When the user tries to update the bios to A34, the message “Application Error Return: 0x00000406” appears.
To troubleshoot a boot error after a faulty BIOS update in 6 steps
- Reset CMOS
- Try to start in safe mode.
- Customize BIOS settings
- Flash BIOS again
- New installation of the system
- Replace your motherboard
Disable Anti-malware protection
Also make sure you have disabled/uninstalled all other real-time third-party antimalware products installed on your PC to check if the update is affected by the firewall.
Disconnecting USB drives
If your system is configured to use USB keys as the first boot device and you leave a non-bootable USB key connected to your system (directly or to a USB hub connected to your system), your system will not boot. Solution? Unplug the power plug and restart your system.
If your system restarts correctly, you have several options:
Do not leave USB sticks connected to your system when you turn off your computer.
Change the BIOS or UEFI firmware settings to ignore USB sticks as bootable devices.
Try to start in safe mode.
Even if this solution is far from complete, it can still help you. In most cases, you will need to perform the above-mentioned BIOS settings reset in order to access the safe mode. Once this operation is complete, restart your PC and try the safe mode.
Unfortunately, it is not easy to access the safe mode as before. To do this, you will need a bootable media drive with system installation or a recovery drive of any kind. In any case, you need a bootable disk to access the recovery options or safe mode. You can create one on any other computer using the media creation tool or the recovery disk creation tool in the Windows 10 settings.
Checking and Changing Drive Boot Order
Should you change the start order? That depends. More and more diagnostic programs can be run from bootable USB sticks and you can also install new operating systems from bootable USB sticks. However, you can also use your system’s DVD or BD (Blu-ray) player for these tasks. Then it’s up to you.
We recommend that you change the boot order on Windows 7 computers when
You use USB sticks to speed up your system with the Windows ReadyBoost function.
They often use USB sticks to exchange information between computers.
For other reasons, you often use USB sticks.
However, you should leave the USB sticks at the top of the boot order if you are using
They often run diagnostic programs from a bootable USB stick.
You install the operating systems from a bootable USB key.
They rarely or never use USB sticks for data transfer.
RECOMMENDED: Click here to troubleshoot Windows errors and optimize system performance
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I am a computer enthusiast and a practicing IT Professional. I have years of experience behind me in computer programming, hardware troubleshooting and repair. I specialise in Web Development and Database Design. I also have a CCNA certification for Network Design and Troubleshooting.