moto g brick after 5.1 update

i updated my moto g to 5.1 nd i downgraded to 4.4.4 thn 5.0.2 update came nd someone clicked install nd then it did not boot at all becaus it was in 5.1 bootloader nd while updating it s downgraded to 5.0.2 bootloader so pls help i want 5.1 qboot