If currency loses 100% of value, it will be worth zero. A complete, 100%, total loss.
A 500% loss would be spectacular! And not possible using commonly accepted laws of the universe such as math.
A dozen peaches experience 100% deflation. They completely 100% go to zero. There are zero peaches. They are gone.
What would 500% deflation do? Using regular math and experiences with donuts and peaches, what happens at theoretical 101% deflation? And 500% deflation? How can something be reduced more than 100%, the point at which it already disappeared?
Inflation is about the loss of value, not deflation. 1£ today will be worth x£ tomorrow, where x < 1.
So for example, a 500% deflation just means that one dollar today buys $6 worth of whatever it could have bought in the past (my math might be off)?