How do I unroot HTC M8. Software statue modified, unlocked, S-ON

I would like to unroot my M8, Software statue modified, unlocked, S-ON. What should I do to unroot? My phone is from Taiwan, I used this RUU RUU_M8_UL_K44_SENSE60_MR_BrightstarUS_WWE_2.22.154 0.4_Radio_1.19.21331147A1.09G_20.57.4196.01L_F_rel ease_387460_signed_2. It doesn't work. Can anyone give me some tips?