The cause of the cracks was not the tremolo hiting the walls. The tremolo post become loose and after that the cracks started to appear.
The holes through the back of the body were an attempt to solve the problem.
When I saw that I couldn't fixed it, I have sent it to the guy how damaged even more the guitar body.
After tha, I've performed the stud post repair, but since the wood is full of cracks, it didn't solve the problem.
Maybe I'll try to perform the stud post repair once again, and like SwedishLuthier said, I'll try to apply some glue where the wood is really cracked.
Can I use epoxy instead of glue ?