FishWarrior, Thanks for the help - surprisingly earned))) But I have not updated, but rather to remove the update for Googla Play. I restart the service and about a miracle - the game Boom Neach became available =)
One problem less.
To summarize: I have now is K50A40_S121_150813_ROW firmware (Region RU) - firmware is generally pleasant.
What does not like:
- Slow operation of the camera shutter
- friezes in games (in particular 10 minutes Clash of Clans perceptibly warm smartphone then begin braking)
If you address these shortcomings, the firmware I am quite pleased.
Maybe somehow it is possible to reduce the CPU speed to avoid overheating? And the question about the camera - there is some hope that the finished cell, and then at least a very long time the camera responds to the shutter button. =)