[q] [d2303] problem with signal

ok guys look I got a used m2 just yesterday from a guy who didn't wanted it anymore all it had was a pattern which he had forgotten, I unlocked the bootloader and from then I have no signal. Phone does understand the presence of SIM card cause when I remove/place it inside the slot it does restart itself popping the classic message sim card inserted. but no signal. what to do ? already flashed 4.3 , 4.4.2, 4.4.4 and nothing at all same message at alla builds.


any solutions anyone? thanks in advance