[Q] How to make an image backup of SGS4 Mini ?

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http://forum.xda-developers.com – Hi experts, How can one make an image backup of SGS4 Mini's original kernel? I am asking cause if i go ahead and root with one of the methods on this forum, and it messes my phone up, i would like to be extra cautious by keeping the option of being able to revert back to factory android image (kernel/ROM) Thanks bhav (HowTos)