protected function upgrade540()
    {
        $result = true;

        // ConfigStore::save should store all settings in 1 serialized value.
        $configStore = $this->getConfigStore();
        if (method_exists($configStore, 'loadOld')) {
            $values = $configStore->loadOld($this->getKeys());
            $result = $this->save($values);
        }

        return $result;
    }