I switched my LG L70 (MS323)'s runtime from Dalvik to ART, after it restarted and said "Android is upgrading..." and it optimized my 64 apps. After it finishes, I get an error message saying something like Unfortunately the system ui has stopped and then my phone restarts and the whole process starts over again. Please help.

2 Answers 2


ART is experimental at this stage, unless you're on android L (Lollipop) I wouldn't recommend using it.

If you are stuck in ART you can get back to Dalvik by following this thread: http://forum.xda-developers.com/showthread.php?t=2707841

Your device should boot then.


Just do a hard reset on your phone.

  • 2
    Do you mean a factory reset? I'm not sure how simply restarting manually would be sufficient to fix the OP's issue. Commented Jan 12, 2015 at 15:00

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