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A "0197: Unauthorized CMOS change detected" POST error is observed during bootup - ThinkCentre A52, M52

A "0197: Unauthorized CMOS change detected" POST error is observed on bootup.

After resolving the error by entering BIOS setup and saving changes, it may appear again at a later time. The error may also appear on systems which have not seen the error previously. No known configuration changes have been performed by the user.

Affected configurations

Any of the following ThinkCentre systems:

  • ThinkCentre A52 (type 8153, 8154, 8155, 8156, 8157, 8158, 8159, 8160, 8161, 8162, 8163, 8164, 8165, 8166, 8167
    8168, 8169, 8170)
  • ThinkCentre M52 (type 8099, 8110, 8111, 8112, 8113, 8114, 8115, 8116, 8211, 8212, 8213, 8214, 8215, 9210, 9211)

Update the BIOS to the latest level. Download and install the most recent version of the BIOS.

You may see the error one final time on the first boot of the system subsequent to the update.

If you are unable to find what you are looking for, please do try the following options:
1. Lenovo Assisted Search
2. Product usage and general troubleshooting tips
3. Lenovo Support Forum
4. Technical Support Call Centre

Country Availability
Document ID : HT036993
Legacy Document ID : SF05-D0103
Last Updated :
Copyright © Lenovo 2013, all rights reserved
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