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This support request is being escalated to our root admin.

It's not as common as it sounds, but it has happened once or twice this year. If you want to convert it, the safest way is export the database to a .sql file, replace all the Engine=InnoDB with Engine=MyISAM in the .sql file, then create a new database and import the edited file. After that, just point PhpBB to the new database, test, and drop the old one. Many people report newer PhpBB having trouble on MyISAM though, so if it acts strange, you may need to find other forum software or just make frequent backups (which we recommend anyway!) so you can restore it if InnoDB decides to go belly up.