Lenovo S820 problem in call with bluetooth headset

Hello All.
I have Lenovo S820. I update smartphone to last version firmware. Information from phone:
Model: Lenovo S820_ROW
Android system version: 4.2.1
Firmware communication module: S820.V21, 2013/08/07 15:14
Build number: S820_ROW_S119_130922
I also connected the bluetooth headset. In the phone attached 2 sim: MTS(3g and 2g), BWK(only 2g)
Problem:
When I call from first slot of sim with bluetooth before whistles Lenovo S820 activate flight mode and disconnect with all providers(MTS and BWK) and after reset call Lenovo S820 turn off flight mode.
In second phone I recive call, but I can't answer a call from Lenovo S820.
I try from different headsets. this problem occur with all headsets.

try to update your firmware with the latest ROW version
[#Update]#Lenovo #S820 with the Latest ROW Version Firmware S221
http://bit.ly/1wPlj9V
Lenovo Guide and Blog http://bit.ly/1hZlF2p

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