Changing the input shape of Pre-Trained Models in KERAS (TF Backend)

Question

I am using transfer learning with the pre-trained model using KERAS with TensorFlow Backend. Now, I want to change its input shape but I am unable to do it.

Following are the current shapes:

model.input_shape : `(None, 16, 112, 112, 3)`

model.layers[0].get_weights(): `(3, 3, 3, 3, 64)`

Output shape of first Layer : `(None, 16, 112, 112, 64)`

What I am trying to do is to change the input shape to (None, 112, 112, 112, 1).

I did try to change the input in json file but I got the error in it.