Solution:
from keras.utils.generic_utils import CustomObjectScope
with CustomObjectScope({'relu6': keras.applications.mobilenet.relu6,'DepthwiseConv2D': keras.applications.mobilenet.DepthwiseConv2D}):
model = load_model('model_saved.hdf5')
from keras.utils.generic_utils import CustomObjectScope
with CustomObjectScope({'relu6': keras.applications.mobilenet.relu6,'DepthwiseConv2D': keras.applications.mobilenet.DepthwiseConv2D}):
model = load_model('model_saved.hdf5')