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  'utf_mode' =>
  array (
    'value' => true,
    'readonly' => true,
  ),
  'default_charset' => 
  array (
    'value' => false,
    'readonly' => false,
  ),

<?
$this->queryExecute("SET NAMES 'utf8mb4'");
$this->queryExecute("SET collation_connection = 'utf8mb4_0900_ai_ci'");
$this->queryExecute("SET innodb_strict_mode='OFF'");
$this->queryExecute("SET wait_timeout=28800");
?>

define("BX_UTF", true);
define("MYSQL_TABLE_TYPE", "INNODB");
define("BX_USE_MYSQLI", true);

ALT ER   TABLE b_admin_notify CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
.............................
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ALT ER   TABLE b_xml_tree CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;