If you have a windows pc you can get Voopoo software to connect to the mod and put it's settings back to default like it came from factory, if that's what your after.
Or suggest a how to vid on YT or the manual.
http://www.voopoo.com/service < just hit Drag 2 Kit
That link also has 'Configuration software (Windows)' at the bottom of the page and is compatible (so it says) with any upgradeable Voopoo device. I know it works with Drag Mini as well. They just came out with it about a week ago.
If you choose the app route, here's what it looks like after you connect your Drag 2.
View attachment 130552
The circled default button is what I'm talking about. Display - Parameters - Temperature Lines - Power Lines tabs all have individual default buttons like circled in red.
Is this the help you need?