I want to upgrade my s2 to lollipop but before that I want to backup my stock rom so that if in future I can reinstall it. Even tell me about best method of rooting I9100 and from where I can download lollipop for i9100. Currently I am running jellybean 4.1.2 version on my s2. You can also suggest me any other good ROM.
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.and : http://android.stackexchange.com/questions/20296/how-do-i-back-up-and-restore-my-phone-before-installing-a-custom-rom – ʍѳђઽ૯ท Mar 26 '15 at 20:15