I have tried to unlock the bootloader following the above mentioned posts in the 1st post of the thread and everything went fine until step 11. After having done everything as described I got a fail message.
Here is the picture with returned value after step 9
As I got a value returned I suppose that everything is ok.
And here's a photo of the result after effected step 11.
Can anybody comment why I did not sucsessfully complete the process?