1 MAJOR step is missing. You must use a metallic spudger tu unstuck the battery witch is glued to the back of the case. There is a small patch of glue located 1 cm from the top of the ipod.

On the KOBO GLOW (very similar to KOBO AURA) : be careful at step 1 not to torn down the ON/OFF micro switch soldered on the mother board. On my model it was not sealed correctly, it opened when I removed the motherboard. I had to put back in place the lever and the spring.