A save file at the end of refrain to unlock the 3 EX routes.
Other Little Busters! Guides:
- Download the file.
- Open the game and save in a empty slot.
- Close the game and replace the files saved in step 2 for the files downloaded (rename them to match the deleted file).
- Open the game and load the save file.
- Click once and wait for the credits to roll (you can alt+tab and leave the game running).
- Hit intro when "saving data something" appear.
- Now you should be able to access the 3 EX routes and Refrain.
No CG is unlocked in the gallery, no option nor text is marked as read (just the last two lines).