sm-j700f cannot flash

hello have several of these phones new in box Along with 5.1.1 firmware which cannot be flashed, frp off, imei status ok, but emergency calls only. tested Along with 6.0.1 firmware but flashing failed (FXXU3BPJ3, FXXU4BRAI, FXXU4BQC6). any ideas and have a nice day.