As Ryom suggested, first back up your database and phpbb files. I would leave the database intact, remove the phpbb directory from the server. Once you have uploaded the full phpBB package, you'll want to run the installer by typing in the url to your domain, and add this to the end
/install/update_to_latest.php
Also, note, you can create a config file, and upload it. I use wordpad to code in. So you could open wordpad, and add the following:
<?php
// phpBB 2.x auto-generated config file
// Do not change anything in this file!
$dbms = 'mysql4';
$dbhost = 'localhost';
$dbname = 'username_databasename';
$dbuser = 'username_databaseusername';
$dbpasswd = 'yourpassword';
$table_prefix = 'phpbb_'; Note* if the prefix is phpbb, it not chane it to the prefix_ you chose.
define('PHPBB_INSTALLED', true);
?>
Set the permission to 644 on this file.
You will lose your mods, but, you would only need to mod the files that are required for the mod, since the database would reatin the current tables, if any were added, for the mod.
