SPListItem.SystemUpdate(boolean incrementListItemVersion) in CSOM
I have not been able to find an equivalent function in CSOM to update a list item without affecting the Modified or Modified By fields. Please add this functionality to CSOM SP2013.

We are happy to provide this update as part of the SPO CSOM updates released late August 2016. See more details from following blog post – dev.office.com/blogs/new-sharepoint-csom-version-released-for-Office-365-august-2016-updated.
Thanks for providing your valuable input on the needed APIs and product capabilities.
2 comments
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Anonymous commented
Is there any plan to have systremupdate available in SP 2013?
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Alexey commented
Do you have any plans when these updates will be available in SP 2013 on-prem?