Would it not be easier to use WPA instead?
Also, can you tell us what kind of wireless adapter you are using? Built-in, USB etc? What brand? This makes a difference to whether you can use hex at all.
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.