Ive found, after much tampering with the apk itself, speed hacking, and testing different bought values and stationary ones, its next to impossible to '999' yourself. The best trick I've had come to fruition is speed-hacking the various things you have to wait on, however, do not stop moving around on the screen as you speed through timers. The error '610006' appears and won't disappear until hours later, and a reinstall. I still don't understand it. Good luck.