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What Is S-Off and a RUU?

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Thanks Meter 48
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Default What Is S-Off and a RUU?

Will I need S-Off to flash ROMs such as CyanogenMod?

What is a RUU?

I am coming from a Nexus 5 and I have never owned a HTC device so I'm unfamiliar with these terms.

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S-off == security off
RUU == ROM update utility
I think. Someone correct me if I'm writing.

Sent from my HTC One_M8 using Tapatalk
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Correct. S-Off allows you to flash anything to the phone regardless of whether it belongs on there or not. Caution should be exercised when you have S-Off. One use for a RUU was a means of flashing the phone back to stock with software leaked from HTC. We don't see much of them anymore.

There are, of course, many other things that both of these things can do. Look in the M8 International forum ( for a much more in depth explanation of both. They have step by step instructions for almost anything you'd need. The ROM's over there are usually applicable to the AT&T model. If not, they'll state it in the thread.

Read, Read, Read. And take it slowly. You could easily brick your phone and void the warranty as well with some of these things.
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