Help with installing stock from..

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http://forum.xda-developers.com – Hey guys, I have a Galaxy S2 i9100G unlocked phone... I installed a custom rom (root box 1.7) but now I wanna go back to the stock rom? Where can I get the firmware.. I forgot the back it up b4 I did the custom 1 Sent from my GT-I9100G using xda premium (HowTos)