I was using TPLINK WN722n in FW 5.xx and was working. Now in 6.xx seems not.
I see that hardware is in system, but no interface is created
[admin@rb] > system resource usb print detail
0 device=“1:1” vendor=“Linux 3.3.5 ehci_hcd” name=“RB400 EHCI”
serial-number=“rb400_usb” vendor-id=“0x1d6b” device-id=“0x0002”
speed=“480 Mbps” ports=1 usb-version=“2.00”
1 device=“1:2” vendor=“ATHEROS” name=“USB2.0 WLAN” serial-number=“12345”
vendor-id=“0x0cf3” device-id=“0x9271” speed=“480 Mbps” ports=0
usb-version=“2.00”
751G-2HnD with Routerboot 3.10