Magento Admin Menu Not Working After Upgrade
Wondering why your Magento admin menu is not showing up after upgrading your live Magento store?
Execute the below code in the Magento database. (Replace your database name here [your_magento_database_name])
UPDATE `[your_magento_database_name]`.`core_config_data` SET `value` = '0' WHERE `core_config_data`.`path` =`dev/js/merge_files`;
Than go to your cpanel hosting and go to Magento root folder. Than navigate to /var/cache/ . Delete everything in that folder.
That’s it! you are back in business 🙂