There is a missing step between step 5 and 6, I think. In step 5, the top case is still attached to bottom case. But in step 6, you can clearly see from the photo that the top case is already separated from the bottom case. But there is no instruction on how to do that!

I think there is a missing step between step 5 and 6. I followed the instructions until step 5, but couldn’t figure out how to separate the top case from the bottom case. In step 6, you can see the top case has been separated from the bottom case. But no instruction is given on how to do that.