code: def compatible_firmware_version(self):
          
          identifier = self.firmware_version.split('compiled')[0]
          buf_size = self.MAX_BUF_SIZE
          buf = (ctypes.c_char * buf_size)()
          res = self._dll.JLINKARM_GetEmbeddedFWString(identifier.encode(), buf, buf_size)
          if res < 0:
              raise errors.JLinkException(res)
  
          return ctypes.string_at(buf).decode()
docs: Returns the DLL's compatible J-Link firmware version.
  
          Args:
            self (JLink): the ``JLink`` instance
  
          Returns:
            The firmware version of the J-Link that the DLL is compatible
            with.
  
          Raises:
            JLinkException: on error.