how to backup samsung s3 system firmware - Android Q&A, Help & Troubleshooting

I have bought a new samsung s3 dual and I'd like to dump or backup its system firmware before using it so that I can install it again if something went wrong with it ? so how to do that?

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[Q] How to Unroot my Samsung Galaxy Ace s5830i

HI All...
I need your Help very Baaadly..
Recently i have rooted my Samsung Galaxy Ace s5830i mobile with universal_gb_root_v25.zip file found one of the Android Site.
Now i want to Unroot my phone due to some reasons.
Could Any one please help me on this..
Regards.
Sanjeev.K
You can restore a backup which you might have made when you weren't rooted, or you can flash the unrooted stock ROM posted in your phone's forum if any.

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Hey,a week ago i updated my Samsung Galaxy S2 to the Android version 4.1.2 and since then i tried to find a way to root it without the computer but nothing would work. So,maybe if you know something please help me.
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I like your thinking. No Pc. Use philz kernel put on ext sd and go to stock recovery and update.

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My regards

Can anyone help me with creating backup of stock ROM of Galaxy Star S5282?

Hi everyone at XDA Forums!
I want to create a backup of my phone's (Samsung Galaxy Star Duos GT-S5282) official stock ROM, in the format used by Odin software for flashing firmwares/ROMs on a variety of Samsung's Android devices. The format in which I would like to create backup is in ".tar.md5" format (used by Odin).
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