Should I disable or hide the Back button in last step of Wizard

I am preparing a wizard for the account setup for the first time users of the application.

Since, it is account setup wizard, there are few actions that cannot be edited. However, the other actions are editable therefore we have provided Back button in all the screens except the last. Therefore the flow is -

Screen 1 - Next button only Screen 2 - Back and Next button Screen 3 - Back and Next button Screen 4 - Finish Button

Should I hide the back button in last screen or disable the Back button, given the action in screen 3 cannot be edited.

Please note that the steps cannot be interexchanged due to business logic.