It might be an issue of OpenWrt and turns out the device won't keep settings. Everything is reset after reboot regardless of "Save & Apply" and "Save".
openwrt-18.06.1-ar71xx-generic-dir-505-a1-squashfs-factory.bin and openwrt-18.06.1-ar71xx-generic-dir-505-a1-squashfs-sysupgrade.bin are both tested.
/etc/rc.local will be executed once the system init finished, it might be an issue of OpenWrt if the settings you changed are not related to this file, in this case, you need to change the settings from command line
It might be an issue of OpenWrt and turns out the device won't keep settings. Everything is reset after reboot regardless of "Save & Apply" and "Save".
openwrt-18.06.1-ar71xx-generic-dir-505-a1-squashfs-factory.bin
andopenwrt-18.06.1-ar71xx-generic-dir-505-a1-squashfs-sysupgrade.bin
are both tested.