Have you at least tried a power-reset please?un-plug from wallpower wait 5 mins then re-plug back in again?
Let me know please
I managed to unfreeze the screen by playing with Z2 & SP keys.
I then encountered the problem of the cash draw not opening. So I found by turning the key to Z2, logging in. pressing Enter, then print- the draw will open.
How do I unfreeze the draw?