http://joomlaupdater.com/ is a Joomla automatic update system. It update not only Joomla but also Joomla extensions, Joomla extensions pack and Joomla full-site automatically. It's awesome application. From now on, Joomla updating will be easier than ever. There are some interesting programs for Joomla users. The 100 first people who register to become the members will be free to update in a month. In addition, you will get bonus points for your activities on this website. When your points are big enough, you can use them to buy the membership or products on http://foobla.com/. On the other hand, if you invite 10 people who register to become members, you will get enough points to buy 3-month membership. These programs will begin at 1st February, 2010.
You should use the trusted solution for the update use docs.joomla there are some very great tutorial for joomla upgrade