i bricked my z3 compact, can someone help me unbricking it? plz?

i was going to try to root my 3 weeks z3 compact, but the root only worked on kitkat 4.4, and i was with lollipop, so i flashed a 4.4 rom to downgrade it, and the device, got bricked.... i already tried flashing custom roms, but never with sucess...
i would be glad if someone could help me....