How to update from joomla 3.0 to 3.0.1
From Joomla! Documentation
This tutorial will show you how to update from Joomla! 3.0.0 to 3.0.1. There is a bug in Joomla version 3.0.0's update component which requires a hotfix.
If you use Joomla!'s FTP layer please see Note 3 below.
Backup your site
The update process is generally safe, but it's always a good idea to make a backup before updating. So please go ahead and make a backup of your site now.
Install the hotfix patch via Extension Manager.
Go to the Install from URL tab
Copy and Past the Update URL
The URL for the hot patch is: http://joomlacode.org/gf/download/frsrelease/17575/76677/joomla_3-0-0_hotpatch.zip. Copy and paste this into the Install URL text box.
If you have any difficulty installing from URL, download the file to your computer and install using Upload Package File.
Set the Joomla! Update Server to Short Term Support
Navigate to Components → Joomla! Update and click the Options button. Change the Update server to Short Term Support as shown below.
Click Save & Close to save the change.
Update to Joomla 3.0.1 via the Joomla! update component
After getting the success message, go to Components → Joomla! Update.
If you see both of the above, Install the Update.
- If you are not getting the "Note: Hot patch for 3.0.1 update is installed" message, then please repeat Step 2 or ask for some help from a trusted developer.
- If you're not getting the "Joomla! update was found", click on Purge Cache button.
- If you use FTP, you might have to FTP the update package, you can download it here:http://joomlacode.org/gf/project/joomla/frs/?action=FrsReleaseBrowse&frs_package_id=6517.