HTC Desire 626s Tmobile
 

I am trying to do s-off and always says this error:

Sending oem writesecureflag 0
... (bootloader) HTC KEY CARD VERSION: 7
FAILPERMISSION DENY (VERIFY_FAIL)
FAILED (remote: PERMISSION DENY (VERIFY_FAIL))
finished. total time: 3.391s
htc_fastboot finished
Operation finished

What is this error?
Please help

always post full log
edited log doesnt help
you must use power adapter tab for s-off
sd mounted must be written on screen before start process

This is Full log for this operation. I am not using power adapter because this phone is old security and there is no need to use power adapter. Remember I am trying to do s-off to HTC Desire 626S from Tmobile