Solutions to the Boot Selection Failed Required Device Is Inaccessible

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Solutions to the Boot Selection Failed Required Device Is Inaccessible

When users booting their computer, there’s a good chance that most of them may encounter the error the boot selection failed. It usually occurs on Windows 7/8/10 and Windows Server 2008 R2, because a required device is inaccessible.

When coming across this error, it means that the computer fails to boot. So, in the following section, we will show you how to fix this error the boot selection failed because a required device is inaccessible.

However, before solving this issue, you had better rescue your data from the unbootable computer so as to avoid incorrect operations giving rise to secondary damage to the data on your computer.

To rescue data from the unbootable computer, you can use the professional backup software – MiniTool ShadowMaker.

After retrieving data from the unbootable computer, you can go ahead to fix the error the boot selection failed because the required device is inaccessible.

Solution 1: Check Computer Cable Connections

In order to fix this boot failure error, you can check the computer cable connection. Please check whether all computer connections are connected properly. After that, reboot computer and check whether the issue still existed

Solution 2. Remove All External Devices

The error of the boot selection failed because a required device is inaccessible may be caused by peripheral equipment. So, in order to fix the boot selection failed error, you can try removing all external drives and then reboot your computer to check whether your computer can boot successfully.

Solution 3. Check Boot Order in BIOS

The boot selection failed because a required device is inaccessible may occur after disk clone since you don’t set the destination hard drive as the first boot order.

So, in order to fix the boot failure error, you can enter the BIOS and check the boot order. If the target hard drive is not set as the first boot order, please change first.

Now, reboot your computer and check whether the error the boot selection failed to get fixed.

Solution 4. Check Disk

If there are bad sectors on hard drive, you may also encounter the boot selection failed error. So in order to fix the boot problem, try to check whether there is a problem on the hard drive. To do that, you need to boot your computer from the Windows installation media and click Repair your computer to continue.

Hit Command Prompt to continue. In the command line window, type the command chkdsk c: /f and hit Enter to continue.

When the scanning process is finished, reboot your computer and check whether the boot selection failed because a required device is inaccessible is solved.

Solution 5. Run Startup Repair

If you encounter the error the boot selection failed because a required device is inaccessible, you can run Windows built-in tool – Startup Repair to fix it. The Startup Repair is a powerful tool that can fix most system problems. So, you can try it.

To do that, you also need to boot your computer from the Windows installation media, then click Repair your computer to continue.

In the pop-up window, click Startup Repair to continue. Then the scanning and repairing process will begin. When it is finished, reboot your computer and check whether the boot selection failed because a required device is inaccessible.

Solution 6. Rebuild BCD

MBR is the necessary file for computer boot. When the MBR is damaged, you can’t boot the computer successfully and may even encounter the error the boot selection failed because a required device is inaccessible. So, you need to fix the MBR.

To do that, you also need to boot the computer from the Windows installation media and open the Command Prompt. Then type the command bootrec /rebuildbcd and hit Enter to continue.

When it is finished, reboot your computer and check whether the issue the boot selection failed because a required device is inaccessible is solved.

Solution 7. Mark the Disk Online
If the bootable disk is offline, you can’t also boot your computer successfully. So in order to fix the boot failure problem, you can try marking disk online.

Then boot your computer from the bootable media and open the Command Prompt window. After that, type the following commands and hit Enter after each command.

diskpart
list disk
select disk x (x represents the disk number.)
online disk x

When the whole process is finished, reboot your computer and check whether the 0xc000000f the boot selection failed because a required device is inaccessible is solved. To sum up, this post has introduced 7 ways to fix the boot selection failed problem. If you want to know more detailed instructions, please read the post: Fixed – the Boot Selection Failed Required Device Is Inaccessible.

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