Expanding on Ahamed's advice. Pre-configure your PC's Eth interface with 192.168.0.10, 255.255.255.0, 192.168.0.1 def-gw.
When you factory default the AP by the physical reset button, all code versions will revert to a 192.168.0.1 IP address.
If you connect your PC directly, you should be able to login by browser, with uid = super, pw = sp-admin.
From there, depending on which code you have installed, you can install new firmware (maintenance/upgrade/local method,
or Unleashed (Show AP Info).
The Solo (18.104.22.168.1347) firmware for R300 is in this .zip file:https://support.ruckuswireless.com/software/1017-zoneflex-solo-access-point-104-0-0-0-1347-ga-softwa...
Let us know if you have any other questions.