xperia SL update

[Suharta]

Iwant to install 4.0.4 becase bettery life is better than 4.1.2 in my sony xperia sl. how i back 4.1.2 jelly been to 4.0.4? Now i am using 4.1.2 jellybeen.

[_alexdon_]

Go to XDA and get a ftf file and a flashtool.