This Article details how to clear cache inside the Blippar App.
Alternatively deleting and reinstalling the app will have the same effect.
1) Open the Blippar App and tap 'Settings' in the top left corner.
2) Tap on 'Developer' in the menu.
Sign in with your Blippar Account
ENSURING YOU ARE SETUP CORRECTLY AT HERE
4) Switch on 'Enable Debug Menu and Log'
5) Return to home screen of Blippar app and tap 'More' in the new menu
6) You can now clear the cache