Anders Kierulf sent me the solution by PM. If I double-tap the home button, hold my finger SmartGo Kifu, and kill it, the problem variations are restored to their original state. Thanks!

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I've been solving go problems on the SmartGo Kifu application for iDevices.

Unfortunately, some of the problems lack some interesting variation. That is not a problem.

By pressing the gear button and pressing "Replay" in the "Tools" screen that comes up, I can enter/try my own variations in a particular go problem. The problem is that sometimes, it is possible to accidentally delete the original variation branches by accident. Furthermore, the variations I try out become part of the problem and sometimes cannot be deleted!

So I have a question and a request.

First, the question: How do I restore the original problem variations and remove the new variations that I entered?

Second, the request (for the developer of SmartGo Kifu): Can you make it impossible to edit the problem variations and add a button for trying out variations without changing the problem itself (The problem solving section of the WBaduk iPhone app has this feature)? This would allow me to verify some variations that are not part of the problem file without changing it. Thanks.