Default [Q] HTC New One(eva air) S-Off problem

Dear All
I have a S-Off problem for my HTC New One eva air version,
There was sucessful S-Off for previous 4.1.1 eva air version,
my phone was something hardware error on recently day,
so I sent the phone for HTC warranty,
but when I receive the phone that HTC give to me is 4.4.2 eva air version,
I can't S-Off anymore even I am using firewater,
any body knows how to S-off this phone,
I am only can root this phone
Android version: 4.4.2
HTC Sense:5.5
Software number: 4.20.796.8
Hboot: 1.56
Current Status: Root and Unlock, S-On