See here, but in Russian.
http://4pda.ru/forum/index.php?s=&showtopic=46354&view=findpost&p=887967
There is an English-speaking topic, can answer
http://4pda.ru/forum/index.php?s=&showtopic=130284&view=findpost&p=3014479
Help me please! I need service manual for AvicS2, tell me where to download? please!