Solved. It is not enough have s-off. Must be unlocked too. I unlocked bootloader without htcdev:
echo -ne "HTCU" | dd of=/dev/block/mmcblk0p2 bs=1 seek=33796 Then flash SuperSU.zip/ Now I'm rooted :victory:
Have M9 S-off, stock 3.35.401.12
Trying get root with twrp-2.8.7.1_CPTB-B1-hima + SuperSU.zip (different versions), after flashing zip boot system but still have no root. :confused:
Please help!