I think you can follow Zachery's first advise and use ./install/tableprefix.php I just tested it on my testboard, and it ran without any problems.
Make sure to close your board before you start this and that you have a backup woithout errors.
Also make sure you have FTP access to the includes/config.php file, because once you have run the script your board will not function until you set the new $tableprefix in your config.
The whole process can bel run in less then a minute.
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