xb8-t

Just got my xb7-t and setup quick. problem is I had to put my old router back in as. I Have 2 older printers, HP m252nw and a Brother All in one and they won't connect.  I changed to wpa2 on the gateway and still no go.  Not much of a speed change. 

Why can't my printers connect.

Also my son's new iPhone won't connect.

With the old linksys router back in all is working, but the xb8 leaves a LOT to be desired.