[BirdOPrey5]

Try a plugin on init_startup hook with this code:

if (strpos($_SERVER['HTTP_USER_AGENT'], 'Opera Mini') !== false) 
{
    header('Location: http://yoursire.com/path/to/explanation.php');
}

Obviously replace http://yoursire.com/path/to/explanation.php with the URL to your actual explanation. This should be accessible to guests.


WARNING - if there is a bug/issue you will need to DISABLE_HOOKS via config.php file to access the forum as the init_startup hook is run even on admincp pages. Any issue there can bring down the entire forum. I haven't tested the code so i can't say for certain it will work,