Got solution from Christian Lamparter
"the two USB 3.0 ports? Then please read on:
Currently, this requires some manual intervention.
This is because the USB 3.0 chip from Renesas' needs a firmware in order to initialize the chip.
Sadly Renesas' never submitted the firmware to
linux-firmware.git and it is only available from their
windows utility... So there isn't a redistributable licence which prevents it from being included in the firmware files on download.lede-project.org.
As for getting the USB 3.0 Ports working: you need to put
the following file: K2013080.mem [0] [1] into /lib/firmware
of your WNDR4700 and either reboot your router, or just
reload xhci-pci module.
link1: http://www.adapter.co.jp/Adapter/PP2U-jp.html
link2: http-www adapter.co.jp/Download/PP2U/USB3-201-202-FW-20120312.zip
Google uPD72020x-firmware_2_powerpc_464fp.ipk
Then download using
https://github.com/chunkeey/renesas-fw/releases/download/1/uPD72020x-firmware_2_powerpc_464fp.ipk
#curl -O http-//url/../uPD72020x-firmware_2_powerpc_464fp.ipk
#opkg install uPD72020x-firmware_2_powerpc_464fp.ipk
to install it. After that either reboot or reload
xhci-pci module and the USB 3.0 ports should be
working.
That's all. If I missed something and it isn't working
please let me know."