Check error 0xC0000221

CMOS checksum error 1 . Preset loaded
The CMOS checksum is incorrect, causing the system to corrupt the device’s default configuration. A checksum error may indicate that the CMOS is corrupted. This error may be caused by a low battery. Check the battery and replace if necessary.

  • how to solve this problem
  • how to protect your data

CMOS Error Message

How do I fix the CMOS error on my computer?

Restart your computer. A normal reboot generates a new checksum and fixes the error.
Download and flash the actual BIOS update. Download the update from the motherboard manufacturer’s website.
Reset the specific BIOS.
Replace CMOS battery.
Contact a technician or computer service person.

CMOS checksum error usually occurs when your computer definitely cannot read the boot information or the write data provided by CMOS definitely matches the data provided during BIOS. Basically, the CMOS checksum error seems to be caused by a data conflict between the CMOS and the BIOS.

How To Fix This Error

It has been shown that there are several ways to correct this error, all of which can be safely applied. However, onIn any case, it is recommended to make a full backup before using these methods.

2. Check CMOS Batteries

How do I fix CMOS checksum error Windows 10?

Restart your computer.
Replace battery.
Repair the CMOS battery terminals.
Reset your own BIOS.
Update BIOS.
Replace any motherboard.

The CMOS module can be battery powered; This is of course not the same as the wide range that powers your computer. The CMOS battery is very small and thick, hidden under a cover around the motherboard. This will replace the battery and the error may never happen again.

4. Restart Your Computer

Is CMOS checksum error bad?

If you encounter a CMOS checksum error when booting the system, it may mean that the system was accidentally reset to factory settings. CMOS contains BIOS related data and may have been reset causing this error. The problem can also appear due to battery depletion Your CMOS.

One of the above methods will fix the CMOS checksum error. However, if this is not the case, try restoring the PC to a reasonable previous state. This process is completely irreversible and you will lose any new files or data I would say PC. Therefore, before you reset your good operating system or the computer itself, you should make a backup of the costs in order to save all the files and data of your computer.

What Causes A Checksum Error?

There can be many reasons why this error appears on almost all PCs, but you can include many common causes of CMOS checksum errors:

  • Prforced shutdown
  • Outdated or corrupted BIOS
  • Motherboard damaged by power surge
  • Faulty/discharged battery

1. Restart Your Computer

Firstly, when you see an error message, just shut down your computer normally and restart it. In most cases, this trick works and you will no longer receive a CMOS checksum error.

3. Reconfigure The BIOS

If you try the above methods and they don’t work, you should consider resetting your PC’s BIOS. If the BIOS is corrupted, it can lead to this error that may appear on your screen. The steps to reset or update the BIOS may vary depending on your computer model.

How Can I Protect My Data Before Restarting My Computer?

You need a software tool that supports backups. Interestingly, DiskInternals Partition Recovery is one of the applications that allows you to back up your data for free. This software application is primarily a programdata recovery for operating systems, but this item includes several rich features, including disk imaging. Disk

Image has always been a form of backup, basically just cloning local storage. It writes everything to the respective disc along with the disc settings. Therefore, if you remount the current disk image, your computer will be exactly as it was when it was backed up.

To create a disk with DiskInternals Partition Recovery Image, do the following:

  • Download and install DiskInternals Partition Recovery on your Windows computer.
  • Run the program installation as appropriate and close the “wizard” which may start automatically.
  • Directly select the drive you want to back up (your most important drive), right-click it, and choose Create Image.
  • Select options and optionally choose a directory to save the disk image to. (Note: Disk images must be accidentally saved to an external drive.)

From to With the free version of DiskInternals Partition Recovery, you can also easily create multiple snapshot disks. On the other hand, if you want to recover lost files with this software, it can recover all items, but you need to upgrade to PRO version before you can recover good idea files.

This is very advanced software. – Results and performance backed by 15 years of successful data recovery experience. It is also the preferred alternative for most IT professionals.

Error checking STATUS_IMAGE_CHECKSUM_MISMATCH returns 0xC0000221. This may mean that the driver or machine DLL has been corrupted.



This check is the result of a serious error in a driver or other model file. The file header checksum does not match the expected checksum at all.

This is also caused by a PC hardware failure on the I/O path to someor a file (hard disk error, RAM failure, or corrupted swap file).


To fix this error, run the Emergency Recovery Disk (ERD) and allow the program to repair or replace the forgotten or corrupted driver file on this system partition. Maybe

They also run a good new in-place update on top of an existing identical Windows. This saves all registry and settings configuration information, but restores all system files. If service packs and/or patches have already been applied a long time ago, then you need to reinstall that company in the appropriate layout (latest service pack, then all post-service patch patches in the order they were originally installed, if applicable or not).

If a particular file was found to be really corrupt in the bug report, you can try to replace that individual file manually. If the partition system is normally formatted as FAT, you can boot from an MS-DOS boot floppy and copy the file from the originalal source to a complex disk. If you have a trainer, you can dual boot another operating system and replace this file.

How do I fix a CMOS error in Windows 10?

This will rebuild the checksum values ​​and fix the CMOS error. Press F1 or F2 on the error website to go to the BIOS setup web page and select Load Defaults, Load Defaults, or another option to reset BIOS settings to default. On some computers, you may need to enter another key (usually Del or possibly F8) to access the Windows BIOS setup page.

If you want to replace this file on a single-boot system with an NTFS partition, you will need to reboot the system by pressing F8, possibly in the OS bootloader menu, and optionally selecting failsafe mode from the command line. From there, copy a new file to your hard drive, different from the original source. If the file is associated with part of the startup process and is used only in safe mode, you must configure the computer using the Recovery Console for write access. If these methods did not help, try reinstalling Windows and then restoring your system from a backup.

Note. If a previous file on the product CD has a filename extension ending in the _ (underscore) character, the file must be unzipped before it can be used. The Recovery Console Copy command detects and mounts compressed files as they are copied from the destination. If you usually usesafe mode to access your car, use the Extend Time command to unzip and copy the file to the destination folder. Can you use the extension command in the environment control line in safe mode.

Troubleshooting the related hard drive: Errors Hard drive errors can sometimes be the source of corrupted recordings. Run Chkdsk /f /r to detect and fix file system theme corruption. It is necessary to restart the engine before scanning the system partition.

Resolving a RAM Crisis: If the error occurred immediately after adding RAM to the system, the swap file may be corrupted, or the new RAM itself may be defective or incompatible.

To see if newly added RAM is contributing to errors, test them

  1. Restore your system to its original RAM configuration.

  2. Use the recovery console to access the partition containing the swap file and delete the pagefile.sys file.