[Q] [HELP THREAD] I need change mi HTC M8 to stock topic

hello, i have a htc m8 with ROM insert coin 6.0.6, rooted
Cidnum HTC_332
- Bootloader UNLOCK
- S-ON
I try to change S-ON to S-OFF with firewater method, but doesn't work. SuperSU permission does not appear on my phone when income:
adb reboot
adb wait-for-device push firewater /data/local/tmp
adb shell
su
chmod 755 /data/local/tmp/firewater
/data/local/tmp/firewater

if they could help me