I'll try to simplify my questions and avoid story telling.
1) Can I start a new sprint without delivering the last one?
2) During sprint 2 can I change or add items in undeliverable sprint 1?
3) How many undeliverable sprints can I have in my product?
I am facing a flexibility problem where the client says that he can change the framework any time and in any way he wants. He argue that scrum predicts flexibility.
I'd like to know if there is a 'scrum way' to deal with this cause in the scrum guide I didnt find really.