lenovo A316i after flashing cannot able to do out going or incomming calls

[AC Question]

hi,
i just flash my lenovo A316i phone, and add this version build number A316i_s040_140730. seems all the function is working fine even wifi also working fine.
but when i receive calls or do out calls then at the same time connection drops and phone say " NO Service". this is happening with both SIM card.

Please help me i stuck with no solution.