Fonera 2.0n snapshot, usb not detected

I´ve installed the latest openwrt snapshot on an old fonera 2.0n but I´m not able to use a simple usb stick. it isn´t recognize at all. dmesg doesn´t show any line when the usb is plugged.
What am I missing ?

root@OpenWrt:~# opkg list-installed | grep usb
kmod-usb-core - 4.14.80-1
kmod-usb-dwc2 - 4.14.80-1
kmod-usb-ehci - 4.14.80-1
kmod-usb-ledtrig-usbport - 4.14.80-1
kmod-usb-net - 4.14.80-1
kmod-usb-net-cdc-ether - 4.14.80-1
kmod-usb-net-cdc-ncm - 4.14.80-1
kmod-usb-net-huawei-cdc-ncm - 4.14.80-1
kmod-usb-ohci - 4.14.80-1
kmod-usb-serial - 4.14.80-1
kmod-usb-serial-option - 4.14.80-1
kmod-usb-serial-wwan - 4.14.80-1
kmod-usb-storage - 4.14.80-1
kmod-usb-storage-extras - 4.14.80-1
kmod-usb-storage-uas - 4.14.80-1
kmod-usb-uhci - 4.14.80-1
kmod-usb-wdm - 4.14.80-1
kmod-usb2 - 4.14.80-1
libusb-1.0 - 1.0.22-1
usb-modeswitch - 2017-12-19-f40f84c2-2
usbutils - 007-9

root@OpenWrt:~# lsusb -t
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M

thanks