Guys, I have solved this problem by simple running this line on terminal: drutil tray eject Hope it works. PS & 1st UPDATE (18/10/2016) So... I had the same issue again and I wasn't able to solve it right away. This time I've had (like some of you guys) to run the command several times. I ran it for like 20x before it finally wake up the drive and release it.
The guide was really helpful. Be careful with all the delicate connections and DO NOT attempt to use not guide-specified tools. Yeah... You heard me, buy a decent Torx tool. :)