S6 edge 5.1.1 after flash no network. Emergency calls only

Samsung s6 edge 5.1.1 firmware . I did root and Repaire Imei number on it and phone was working fine . Everything was working until I try to restore on smart switch with Samsung official firmware now after done that it’s not connecting to network . only showing "emergency calls only". I’ve tried flashing with other 5.1.1 firmware but no luck . Imei / baseband everything is there but still no network . Can some one please help how to sort this problem out? Thanks in advance