htc desire 520 frp lock remove error

when i try to remove frp lock in xtc2clip
it says s-on problem it must be s-off.
and i try to s-off using xtc2clip in memory card of desire gives an error

here is log:

"Removing FRP protection
Rebooting to bootloader mode…
WARNING: It seems that your phone is not S-OFF! Please do S-OFF first in case of error
Phone DISconnected
ERROR: Is your phone S-OFF?
Phone connected [FA58PBA00926] *** Fastboot mode"

in phone
error [-1]ile] open
there is no OPGQDIAG


pls help