help about rooting

hello
i have htc m9 t-mobile
with RUU_HIMA_UL_M60_SENSE70_TMUS_MR_TMOUS_3.39.531.12 and unlocked and s-on
and i want to root my device even i installed trwp 2.8.5
and after installed the superuser .zip file, the device keeps loop booting and didn't finish
could you help me please please please

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