It is strongly recommended to create a backup before starting the update process. If you have important data, create and try to restore a backup to ensure that everything works properly.
You can upgrade the application only without modifying any other stack components. Follow these steps:
Backup the configuration file at installdir/apps/phplist/htdocs/config/config.php, together with any installed plugins.
Backup your current phpList database.
$ installdir/mysql/bin/mysqldump -u root -p bitnami-phplist > ~/phplist.sql
Remove the application directory:
$ rm -r installdir/apps/phplist/htdocs
Download the latest version of phpList.
Decompress the downloaded file and copy the public_html/lists directory to the phplist/ directory.
$ tar xvf phplist-X.X.X.tar.gz $ cp -r phplist-X.X.X/public_html/lists installdir/apps/phplist/htdocs
Recover the previous configuration by copying the configuration file you backed up earlier to * installdir/apps/phplist/htdocs/config/config.php*.
$ cp config.php installdir/apps/phplist/htdocs/config/config.php
Browse to the application home page, and you should see a message telling you that the database is out of date. To correct this, click the upgrade link on the page.