How'd your do this? this is the first report I've seen of successfully getting s-off on 1.56. This gives me hope.
What method and how many attempts did you make? Mac or Windows?
I tried all kinds of methods best known to me but none worked while I was on kitkat version 4.06.651.4) using firewater.so this is exactly what I did,
I upgraded to software version 4.06.651.9 (kit kat) before firewater actually worked.So if you really want to achieve s-off using firewater,then you have to upgrade to the latest version number of kitkat.
1.Upgrade to the latest version of kitkat(4.06.651.9)
2.Unlock boot using htcdev.
3.Install custom recovery and superSU to get root access.
4.use firewater to achieve s-off.
Infact firewater worked the first time I tried after installing the latest software(4.06.651.9)
So I advice you to install the latest software and keep your eyes on the phone to grant super user access.
hope this helps.