I have a HTC One M9 which I managed to root a while back but now I want to unroot and go back to stock. I have been doing research but can't find exactly what I need. I am in the UK and my carrier is o2. I am also currently s-on and not sure if I have to be s-off or not to achieve this. Can somebody please help me with instructions etc. If there are any other bits of information you need please ask and I will get it for you. TIA
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