What is the error that boot manager failed to find OS loader?
What causes the error that Startup Repair missing OS loader?
How to fix the error code 0x490?

This post fromMiniToolwill show you the solutions.
What Is the Error that Boot Manager Failed to Find OS Loader?
Startup Repair is a Windows built-in tool that can help you to fix some Windows errors.

Repair action: File RepairResult: Failed.
Error code = 0x490Time Taken = 4767 ms
Repair action: Boot configuration data store repairResult: Failed.
Error code = 0x490Time Taken = 150 ms
Repair action:System RestoreResult: Failed.

Error code = 0x1fTime taken = 68489 ms
So, what causes the error code 0x490?
What Causes the Error that Boot Manager Failed to Find OS Loader?
And the Startup Repair missing OS loader error may be due to the following reasons.

Way 1.
Now, here is the tutorial.
Hence, you better create thebootable mediato boot the unbootable computer.
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Go to Microsoft official site to download theWindows Media Creation Tool.
Then run it on a normal computer and create the recovery drive.
Then choose the language, time and keyboard input.

Next, clickRepair your computerto continue.
In the System Recovery Options window, clickCommand Promptto continue.
- pop in the commandsfc /scannow /offbootdir=C:\ /offwindir=C:\Windowsin the command line window and hitEnterto continue.

(C is the partition which holds your Windows 10, 8, or 7 installations.
If you have installed Windows to a different partition, you should replace it.)
Related article:Quickly Fix SFC Scannow Not Working (Focus on 2 Cases)
Way 2.

In this situation, you’ve got the option to choose torepair bad sectorson hard drive.
Boot your setup from the Windows installation media.
Choose the language, time and keyboard input.

- punch in the commandchkdskC: /f /rand hitEnterto continue.
(c refers to thesystem partition.)
When all steps are finished, reboot your machine and check whether the error code 0x490 is fixed.
Wonder using CHKDSK /f or /r to check & fix hard disk errors?
Check difference between CHKDSK /f and CHKDSK /r.
Learn how to run CHKDSK /f /r Windows 10.
Way 3.
Now, we will show you the detailed tutorial.
Connect the Windows installation media to your box.
Boot the computer from it.
- go for the time, language and keyboard input.
Then clickRepair your rig.
Next, clickCommand Promptto continue.
In the pop-up window, bang out the following commands and hitEnterafter each command.
Then run this option again.
By doing this, you better see to it that the BCD is completely rebuilt.
If none of the above solutions works, you may need to reinstall the operating system.
I have encountered the error that boot manager failed to find OS loader when I booted the computer.
I tried a lot of ways but this post helped a lot.
You may wonder why you should do that.
As a matter of fact, creating a system image is very useful.
So, you’ve got the option to know the importance of system image.
Meanwhile, to create the system image, the professionalWindows 10 backup software MiniTool ShadowMaker is strongly recommended.
It is designed to back up the operating system, files, folders, disks and partitions.
In addition, it is a clone tool which allows you toclone OS from HDD to SSDwithout data loss.
So, in the following section, we will walk you through how to create the system image.
Download MiniTool ShadowMaker from the following button or choose topurchase an advanced edition.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
2.
Then install it on your system.
Then clickConnectinThis Computerto enter its main interface.
After that, go to theBackupYou can see that the operating system is chosen by default.
However, if you want to change backup source, you might clickSourcemodule to continue.
Then clickDestinationmodule to select a target disk to save the backup files.
it’s advisable to choose an external hard drive.
After selecting the backup source and destination, clickBack up Nowto start creating a system image immediately.
When all steps are finished, you have successfully created the system image and the bootable media.
If you have come across the same error, you might try these solutions.