So u didn't have to do any thing except just put in the 64 gig card if I read things right?I know im suuuupppeeeeerrrrr late to this party, but i can confirm that a 64GB card works. I'm using a Sony 64GB Class 10 SD Card and it works perfectly. I can't speak for stock firmware but i'm using it with CM12.1. Once you insert the card, Android will prompt you to format it before you can use it. If it doesn't prompt you, then format it in the settings and you will be good to go! Hope this helps new users skimming the threads
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