confused with this one X

I received a one X in bootloop condition.
so I tried to s-OFF and superCID to write any rom

I noticed the process goes well all the way, it asks me to reboot, I reboot into fastboot again and phone is still S-on
it is like if things are not really getting written into the phone.

I tried to unlock bootloader, to install a custom recovery and custom rom

the unlocking bootloader process goes well til the end
I answer Yes with volume keys and phones does its last stuff and reboots, since it is bootlooping I force it to go into fastboot again.

when I reboot, phone is still bootloader locked.

Maybe is there a HW fault which causes things to not getting written?

I have tried few times, getting same results.