If you're still looking for this, the answer is: insert anything to entry point, pry the bottom outwards.
There are 1 huge and strong clip on both left and right (position: center), and 3 clips on the front and back (position: left, center, right). The clips on the center of each side is 15mm wide. I recommend you to insert a pry tool (metal ok, not weak/floppy), slide it till you hit the clips, then pry the bottom part outwards.
For the back one, I flexed mine, but little by little and pry the entry points