Some of our players have reported that the 2.00 Vita firmware has not yet resolved the game startup issues, including error C1-6427-9, and they are still having trouble starting up the game. Therefore, we have contacted Sony in an attempt to work out the solution for this, and they have replied us that the problem is fixed, but it needs the Vita restore to go into effect.
To recover from error C1-6427-9, the user must restore PS Vita settings via “Settings->Format”.
Let me remind you, that your savedata remains safe and intact on our server, your progress will not be lost. We know, that it is probably not the most graceful solution, but the only official one we have, so please bear with it - and have a good time playing our game again!