Before all, thank you very much for response. I didn't want to insult anyone because I mentioned Google, besides of all, I know this is the most expirienced forum for Sony Ericsson mobiles, that's why I had looking for help here.
I used search button to find my firmware version that doesn't exist, so you gave me links for different fw version on what I thought that something isn't logical. If that you had written is correct, I'll try it.