Proper way to manage offline database with many large images and with update feature

In my current project I need to handle a large database of many large size images and the application should run in offline mode. The application need to sync the latest data with the server.

Some of images are having size of around 5 Mb

1. 
   

   One approach is to download a zip containing the data when application start first time and store their reference in SQLite database.

   
   


2. 
   

   Other approach we can use is to download all data from service in JSON format when application launch first time.

   
   

Is their any other more suitable method I can use for this application? Should I store images in SQLite database? How can I sync the latest changes with server?