Hey gays I bought a GA-J1900N-D2H for my xpenology.
At first I can't see any usb devices on my DSM5.0-4458 include flash device and Epson printer
then I change a lot of things just like genboot,nanoboot ...but it's still did't work.
so,I load default BIOS set and USB option XHCI =>Enable
then I can use any usb devices on my DSM5.0-4458.
so if you have same problem just setup the option just like me !!!