I've found the problem, don't understand how it happened tho... i opened the shift cover and gear cover and played with things trying to figure how it works, after a bit of playing I've found a rod than should move to put the reverse on, it looks like it was stuck on reverse position it, the part that moves it from the shift fork kind of disengaged from the place it should have been so it tried to go front and reverse at the same time, it also prevented the parts to move down enough to engage the 1st, 2nd and reverse gears. I'll try and post a few pics later on. I just feel like i'm becoming a master of the manual transmission.