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1. Login to wp-admin
2. Go to Settings » Permalinks, and simply click on Save Changes button.

This will update your permalinks settings and flush rewrite rules. In most cases this solution fixes the WordPress posts 404 error. However, if it does not work for you, then you probably need to update your .htaccess file manually.

Login to your server using FTP, and modify the .htaccess file which is located in the same location where folders like /wp-content/ and /wp-includes/ are located. And manually add this code in your .htaccess file:

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