I Solved the problem!
Since i could just not get out of the DFU mode i waited for the battery of the iphone to run off (i did this because the connect to itunes screen didn't disappeared even if i hold the sleep button, so i took advantage of it😀). I then connected it to the computer and it entered now on restore mode instead of DFU mode, so i just used iLiberty to kick the iphone out of recovery mode and bam.. The iphone returned to me 🙂