Hi
This is the summary of the method. It is simple!
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Go to Windows Explorer, click on View then check hidden items.
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Go to C:*Yourusername*\pc\AppData\Local\BraveSoftware\Brave-Browser\User Data\Default
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Copy the files Bookmarks and Bookmarks.bak, then paste them in a safe place you can remember
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Go back to C:*Yourusername*\pc\AppData\Local\BraveSoftware\Brave-Browser\User Data\Default, delete the file Bookmarks, then delete the extension .bak of the file bookmark.bak, finally restart Brave browser.