I've installed openwrt on my kimax U25CWF, and for that i've used "15.03.ramips-mt7620-u25cwf-squashfs-sysupgrade.bin" and was working ok, for some time, but now I've messed up the network connections and can't get access to the device, because it only has wifi connection. Does anyone now how to connect with serial to this device? I need to reset the config.