Can I upgrade/swap the SSD on NP940X3K-K02US

Can I upgrade the SSD on the Ativ Book 9 plus NP940X3K-K02US ??? This is the newer laptop with the Broadwell chip. It comes with a 256gb. I would like to upgrade to 500gb. According to Samsung they say no, however on the Crucial website ( http://ift.tt/1RRlPvG ) it says its compatible. Any thoughts??? Thank you in advance.

Can I upgrade/swap the SSD on NP940X3K-K02US