Cannot flash phone to install TWRP (One plus One) I have a one plus one phone and I am looking to install TWRP on it as its built in OS crashed. 
I have run 

fastboot oem unlock


the result is 


  
    ... OKAY
  


command to unlock the phone but when I run 

fastboot flash recovery c:\recovery.img


I get the error message that


  
    writing 'recovery' Failed remote: Device not unlocked cannot flash or erase
  


I have gone over the docs but have not found anything helpful.
Note: Before the OS crashed I had not enabled USB debugging (Could this be the issue)?
Have you rebooted the device after "Unlocking bootloader"?


  fastboot reboot


You need to execute this command before flashing custom ROM.
Also, You don't need to turn on USB debugging when unlocking bootloader.