Need Help: I am new Android user! !!

[6mackenzie4]

Hi I got an S4 passed onto moi.
Is there a way I can safely restore it to factory settings (just as officially from Samsung)?
I ask this because when I try to update software, this error shows "Your device has been modified. Software updates are not available".
I tried to find a quick fix, but very confused.
I read some stuff on here like Odin, Kies etc; and 'rooting'(is that the Android version of jailbreaking?)
I have no SD card mounted and my Device Status says Custom.
I already did Factory data reset via Settings

I would like a condensed version of steps on how I can restore my S4 to mint condition safely.
I don't know which other info you folks might need so...Please assist!

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[belodion]

The device has presumably already been rooted and had a custom ROM installed. Check this guide from Golfdriver97:
http://forums.androidcentral.com/am...ide-samsung-how-flash-stock-rom-via-odin.html

...And this one from UJ95x:
http://forums.androidcentral.com/am...ng-reverting-back-stock-without-computer.html

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