*Remider: before your get start should backup all your database & deactivate your plugins
step 1: delete your old file such as, wp-includes & wp-admin folders.
“don’t delete this file”
* wp-config.php file;
* wp-content folder; Special Exception: the wp-content/cache and the wp-content/plugins/widgets folders should be deleted.
* wp-images folder;
* wp-includes/languages/ folder–if you are using a language file do not delete that folder;
* .htaccess file–if you have added custom rules to your .htaccess, do not delete it;
* robots.txt file–if your blog lives in the root of your site (ie. the blog is the site) and you have created such a file, do not delete it.
then set your wp-config.php match to your database
Step 2: Upgrade your installation by go to main admin page for this will update your database to be compatible with the latest code. If you fail to do this step, your blog might look funny.
Step 3: Do something nice for yourself
If you have caching enabled, your changes will appear to users more immediately if you clear the cache at this point (and if you don’t, you may get confused when you see the old version number in page footers when you check to see if the upgrade worked)
Your WordPress installation is successfully upgraded.
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