Step 1: First of all, connect to your web server via SSH. Using putty or any SSH client.

Step 2: Once your SSH connection is established, you will need to navigate to your Magento 2 ROOT directory.

Step 3:

 php bin/magento module:disable Exstions_Name  

Step 4: Check Module Status

 php bin/magento module:status  

Step 5: Now follow the order and use the following commands

 rm -rf var/generation, var/cache, var/page_cache, var/view_preprocessed, var/di  
 php bin/magento setup:upgrade   
 php bin/magento setup:di:compile   
 php bin/magento setup:static-content:deploy  
 php bin/magento cache:clean   
 php bin/magento cache:flush   
 php bin/magento indexer:reindex  

Update Magento 2.1.3

Upgrade/Updating  Procedure of Magento 2 by following these simple steps:

Step 1: First of all, connect to your web server via SSH. Using putty or any SSH client.

Step 2: Once your SSH connection is established, you will need to navigate to your Magento 2 ROOT directory.

Step 3: Now follow the order and use the following commands:

 composer require magento/product-community-edition 2.1.3 --no-update  

 composer update  

 rm -rf var/di var/generation  
 php bin/magento cache:clean  
 php bin/magento cache:flush  
 php bin/magento setup:upgrade  
 php bin/magento setup:di:compile  
 php bin/magento indexer:reindex  

After upgrade, check your Magento version with the following command:

 php bin/magento --version  

Complete Working.

Try something like that:

 $category_attribute = Mage::getResourceModel('catalog/category')->getAttributeRawValue($category->getId(), 'premium_banner', Mage::app()->getStore()->getId());