How to Install,Return Back Original Stock ROM/Firmware on Samsung Galaxy S3 (S III GT-I9300, U.S and Canada)

This is the step by step procedure on how to manually install back the original firmware or Stock ROM on Samsung Galaxy S3 I9300 International, U.S.A and Canada variants. Installing or flashing the stock ROM is useful in some other part like, if you want to return back your Galaxy

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