[Q] I am a Newbie in Android and I Would like open a Firmware Android (Galasy S3)

Hello

I'm Master in Hacking of Bada 2, I'm the Foundator of a Forum on Bada 2
I created several Firmwares in Bada 2
But In Android, I Know nothing

I'm a Newbie in Android

I would like open a Firmware Android 4.1.1 Jelly Bean
and I don't Know the programs to use for open this Firmware

I hope that you will be cool with me :D

Best Regard
Loup