Is there any possible way to unlock the OEM?

Is there any possible way to unlock OEM without going to developers option? Why i ask that? because I factory reset my HTC One M9 and im stuck on Google account login and I forgot what gmail i used to it. So i dont have access to my phone's settings to go to developer's setting and unlock the OEM there. And now i tried to unlock my bootloader with the help of Htcdev i follow all the steps until step 5 when I try to put the fastboot oem get_identifier_token i got this message appeared on my cmd

C:\adb>fastboot oem get_identifier_token ...
(bootloader) [KillSwitch] : /dev/block/bootdevice/by-name/frp
(bootloader) [KillSwitch] Last Byte is 0X00, disable unlock
(bootloader) [KillSwitch] oem unlock Turn Off!

and i tried this commands fastboot erase userdata and fastboot erase frp and this is the result

erasing 'userdata'...
FAILED (remote: Partition userdata erase not supported)
finished. total time: 0.031s

So is there a possible way to unlock oem without going to developer's settings/option? I's still hoping there's a way to fix my phone. btw im S-ON

from xda-developers http://ift.tt/1UAaxey
via IFTTT