How to make the sound was louder.
Option 1. Go to Audio. We are interested in the following menus: Normal Mode, Headset Mode and Speech Enchancement. We go in Normal Mode, here we need a list of Type and Value values. All values ​​should be in the range of 0-255, while the smaller the value, the louder the sound, i.e. 0 is louder than 255.
In Type, choose what we want to change (Tone - the volume of the call, Key tone - the volume of the keystroke, Microphone - the volume of the microphone, FM - the volume of the radio, Speech - the volume of the speaker when talking, Side tone -? Audio - the volume of the multimedia) set the desired value 0 -255 press the "Set" button - install. Similarly, you can change the Headset Mode mode in the headphones.
I'd add to the value of 0 I do not advise to put, may fail and may even sound the abyss (I did that) or the speaker will wheeze (was too). Me, I set the value of 1-5. If, after some manipulation of all the sound you have gone, and nothing comes back back - I did wipe, setting back to default (as do wipe written in the "FAQ and Installing Drivers", after a wipe have to install / configure all over again) . Another may be help - reset (phone settings ->confidentiality ->reset).
Option 2.
To increase the call volume, dial * # * # 3646633 # * # * (engineering menu)
next menu Audio
further LoudSpeaker Mode
Type should be Ring
Level select Level 6
Value we put 250 we press set
Max Vol. we put 160 we press set
To increase the volume during a conversation:
1. enter the engineering menu (dial the combination on the phone screen) * # * # 3646633 # * # *
2. Choose item AUDIO
7. find the parameter Speech enhancement (which will be edited so that we can hear the caller well)
8. Click on Common Parameter and select - Normal mode
9. Click on Parameter - 0 and select Parameter - 6 (by default it is 400)
10. Start editing the parameter and change its value from 400 to 1 and then click on Set
==== Increase the audio recording volume when shooting video - engineer mode>audio>loud speaker mode>mic - value 160 (for me) at ALL 7 levels is changed to - 255 with confirmation (set). The device is rebooting and trying.

Now for the Speech Enchancement, on forums kitayfonam for clarity of speech are advised to change the following parameters: in Speech Enchancement select - Normal Mode, Parameter 6, change the value to 400 to 1. I honestly did not feel the difference, you can have a musical ear and you will notice the difference, and maybe it is for our model should be changed another Parametr.
Look like that's it. After changing the settings, restart the phone.