Cant send messages and call after 6.0.1 update

Hi guyz. I need your help because i have 2 problems after 6.0.1 update. My model is E2303 and i have found 2 bugs. 1 i cant make calls, its show me that im callin someone but after secs the call ends. 2 cant send messages. I went through pc xperia program troubleshoot. After reinstalling the firmware through the program, again the same bug. Please help me.
What i should make? Unlock bootloader and flashing ftf manual?

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