I've done some changes in master page in SharePoint Designer. After that I'm trying to roll back to the original of master page.
It's showing error
Something went wrong
I need to get my original master page .
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Error something went wrong is probably due because you didn't check in your masterpage (and approve it) even you'd like to cancel changes.
So first do this, validate totally the masterpage and try to restore a previous version before your changes.
If you cannot do this, create a new site collection, then pick up the masterpage from this site and replace the one you change.