I have removed the menu from Appearance -> Menu, which means it was deleted from the database. Please provide us with the database value for rebuilding that menu as in the electronics demo and we will insert in the database.
This would not help you. If you upload the DB, it would rewrite the whole site. You can remove everything, make net WP installation and install our theme and get the same. You see we have our own customization and WPML plugin if I provide you DB it would not be imported without errors.
Make the full backup of all your content through the Tools > Export. Then reinstall all. The best way is to contact your host support they should have the backup, just restore your site.