NOTE: (THIS MEANS READ)
1.) RUN PROGRAM AS ADMINISTRATOR (OR IT WILL FAIL)
2.) If windows 8 nags that it might be unsafe just click more info and click RUN ANYWAY. (Reason: I modified the exe file to flash CM11s rather than Color OS and it causes it to loose the signature.)
3) If drivers dont work or your device is not detected for whatever reason install the QPST tool.
1.) Connect your phone to your PC.
2.) Make sure the OnePlusRecoveryTool is open and your PHONE IS OFF.
3.) Hold Volume UP + Power
4.) Your computer should detect it (If not then install proper drivers, Look below)
5.) Click Refresh - Something should be different on one of the columns of the program.
6.) Click Start (Make sure Normal Restore is ticked)
7.) It should flash (It might take a long time to flash System.img and or Userdata.img sometimes)
8.) It will show green once its done, at this point you can disconnect device and hold power to reboot.
9.) You should be fully restored to stock CM11s. Enjoy
Video on how to use:
Downloads in Second Post (Thanks Guinea Pig :P )