I’m trying to updtae cart manually. In controller file:

public function execute()     {         $  id = 298;          $  params['id'] = 298;         $  params['product'] = 6765;         $  params['selected_configurable_option'] = '';         $  params['related_product'] = '';         $  params['form_key'] = 'S3Tlt9UviUqCPaIu';         $  params ['super_attribute'] = array('135' => '608');          $  params['qty'] = 3;          if (!isset($  params['options'])) {             $  params['options'] = [];         }         try {             if (isset($  params['qty'])) {                 $  filter = new \Zend_Filter_LocalizedToNormalized(                         ['locale' => $  this->_objectManager->get(                             \Magento\Framework\Locale\ResolverInterface::class                     )->getLocale()]                 );                 $  params['qty'] = $  filter->filter($  params['qty']);              }              $  quoteItem = $  this->cart->getQuote()->getItemById($  id);             if (!$  quoteItem) {                 throw new \Magento\Framework\Exception\LocalizedException(__('We can\'t find the quote item.'));             }              $  item = $  this->cart->updateItem($  id, new \Magento\Framework\DataObject($  params));               $  this->cart->save();} 

Its not work fine.If any modification in my code.

If anyone knows please explain me.