This Magento upgrade tutorial will help guide you through the process of updating / upgrading your Magento installation from 1.4+ to 1.8.1,0. which was released on Dec 11, 2013. For the purpose of this tutorial, we will assume you have access to SSH on your hosting account. You should always create a backup of your entire website/database before proceeding with an upgrade and never perform these steps on a live store. Please be sure to obtain updated files from the authors of any Magento extensions you have installed on your website.
Please know that Joomla has released a security update for Joomla versions between 3.1.0 and 3.2.2. Please update to version 3.2.3 at your earliest convenience. If you are interested in having our team implement this update, please contact us.