My phone has frozen after switching to ART mode, how do I fix it?

A

AC Question

ART switching problem upgrading! Please Help!!!

So I tried to turn on private mode and it said error so I googled and found something that said to switch to ART mode and so I did and so my phone started to restart (samsung galaxy s5 from at&t) and it went smoothly and it suddenly just stopped at "Android is upgrading... 309 of 338" for about 2 hours now and I tried to restart it with the power button + homebutton + volume rocker but it doesn't work. What can I do???
 

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