[Guide] HTC ONE Hboot 1.57 Root S-Off Change CID Downgrade Hboot & OS
Search the above phrase on google. The first result should be from the site forums(dot)gsmhosting(com) with the title same as search.
I am a new user so I can't post external links.
I used that guide to achieve S-Off on my HTC One M7 UL with Hboot v. 1.57.
I had to run the final firewater commands several times before firewater launched finally. Enough tries to make me memorize those commands so I stopped copying and pasting them and instead actually typing them. But it worked for me.
I hope it helps.