Joomla 2.5: How to Update Joomla
In this article, we will show you how to update your Joomla 2.5 site to the most current 2.5 release.
Joomla 2.5 is very easy to update. The only thing you need to do is use the built in update tool found in the administrator panel.
Please Note: If you have made custom changes to your Joomla site, uploading theses files could overwrite these changes. If your site is stock (meaning no custom code changes), than you should be fine. Remember to always make a backup before making big changes like this.
1) Login to your Joomla Administrator panel.