I9300 rooting-unrooting

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http://forum.xda-developers.com – Hello everybody, I'm new here :) And I got newbie question. I want to root and install Custom ROM'S to my device(I know how to that), I'll make my stock ROM 4.1.2 backup(in CWM). I was searching, and found, that I can un-root my device(get back warranty), but every tutorials says, that I will need download stock rom from Sammobile, but there arent firmware from my region. The question, do I will be able use my own backup like stock firmware in un-root proccess ? (Dont dowload firmaware from sammobile, but use own backup) If answer is "Yes", second question is, do I be able to reciev (HowTos)