def METHOD_NAME(self, frame_list_fixed):
    """
    :param frame_list_fixed: list of indexes of frames whose lens models to be fixed
    :return: updated fixed lens model parameter in the FittingSequence()
    """
    for j in frame_list_fixed:
        if self._index_lens_model_list[j] is not None:
            for i in self._index_lens_model_list[j]:
                self._lens_fixed[i] = self._kwargs_temp["kwargs_lens"][i]