Hi,
I have searched for you, but do not found the source code you need. I will do further confirm for you.
Here you can try to use the MFG Tool to set the OTP Bits. The MFG Tool also has some flaws in 64bit environments (when clicking on Options->Configurations->USBport the program crashes, so just don't click there), but it works well enough to burn the OTP bits.
Have a nice day
Rita