- Log in to control panel and close board
 
- Backup the database:
 
mysqldump --opt -u USERNAME -p -h localhost DATABASE_NAME | \
  bzip2 -c > BACKUP_FILE.sql.bz2
- Backup the installed files:
 
cd path_to_forums_install
sudo tar -c -v . > ~/BACKUP.tar
gzip --verbose -9 ~/BACKUP.tar
# still in path_to_forum_install
sudo chmod -R 777 .
- Upload all files/folders except for the 
includes, languages, styles and cache_builders/custom directories. 
- Restore permissions to their prior state:
 
sudo chmod 755 .
sudo chmod 777 includes
sudo chmod 666 includes/*
sudo chmod 777 sessions
sudo chmod 777 templates/compile
sudo chmod 777 templates
sudo chmod 777 cache
sudo chmod 777 cache_builders
sudo chmod 777 cache_builders/custom
sudo chmod 666 cache_builders/custom/*
sudo chmod 777 styles
sudo chmod 666 styles/*.php styles/*.css
sudo chown -R apache_user:apache_group *
- Run the upgrade script 
install/upgrade.php from within the browser 
- Remove the install directory from the server
 
sudo rm -rf install