I broke the yellow clip, I don't know if it's possible to keep it intact.

The green bit holds a metal tooth from the main case: at that point pull the back cover towards the top of the recorder.

Using a thin pry tool undo the back cover clips.

Start at the top and work your way around.

On the side with the USB connector slider there's a strong clip, I suspect at that point you have to pull up towards the top of the recorder. I broke off mine trying but it doesn't show once closed.