ls450 dont put in download mode [Answered]

i flashed a ls450 with the firmware LS450ZV5_12 using the model ls675 with octopus box lg and ...died!
so i did jtag with medusa pro correctly, but it still dont get in download mode and when i tried to flash with medusa it gave me an error
#greenWriting partition modem... ERROR[007]: Command fail. #redAt sector 16544
please help me!!