I'd lean on the side of optimism since MicroCenter told you it would work.
If it doesn't go back and explain the situation. If they're a halfway decent company in any regard they'll let you swap the board for a different one or even install the update for you. In person is the way to go about doing this too, assuming you're able to get back to the same MicroCenter without much trouble.
Still, don't stress about it because there's nothing you can do about it now.
Also there's this. Probably doesn't hold much weight, but still.
http://www.tomshardware.com/answers/id-2203978/4790k-work-z97x-gaming.html
If it doesn't go back and explain the situation. If they're a halfway decent company in any regard they'll let you swap the board for a different one or even install the update for you. In person is the way to go about doing this too, assuming you're able to get back to the same MicroCenter without much trouble.
Still, don't stress about it because there's nothing you can do about it now.
Also there's this. Probably doesn't hold much weight, but still.
http://www.tomshardware.com/answers/id-2203978/4790k-work-z97x-gaming.html
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