What I should to do with my HTC one m8

Hi,
I have the HTC one m8 16GB 5.0.1 lollipop ..
when I'm buy it , i didn't have any idea about the Root or Roms ...
after that my young brother discovered the Root in the device, so we search to Uninstall the Root from the device ...
after that we found the simple way to Uninstall it from the inside of the app and we did this step in the hope to Uninstall it ..
But it is stay loading and didn't finish so after one hour i'm exit from this step ...
the problem is the SuperUS in me device is didn't work with any of Root Apps (rom manager,game killer,game hacker....etc)..
So, I wanted to change the Rom to restock the device ..
And start to turn off the s-on but i'm interface problem in this place which is on the SDK windows :
- adb reboot
- [COLOR="rgb(0, 191, 255)"] adb wait-for-device push firewater /data/local/tmp [/COLOR]
- [COLOR="rgb(0, 191, 255)"] adb shell [/COLOR]
- [COLOR="rgb(0, 191, 255)"] $ chmod 755 /data/local/tmp/firewater [/COLOR]
- [COLOR="rgb(0, 191, 255)"] # su [/COLOR]
- [COLOR="rgb(0, 191, 255)"] # /data/local/tmp/firewater [/COLOR]
After this steps the \s-on should be S-off but he want another step ..
I'm search abut the plus step and didn't found anything so what i should to doing?