Thanks for the quick answer. cudy provides two versions of firmware: their customized OpenWRT and a non-customized one. (I have installed this one: Powered by LuCI openwrt-19.07 branch (git-20.136.49537-fb2f363) / OpenWrt 19.07.3 r11063-85e04e9f46) I also tried to use one I downloaded from this page but I got an error message that it would not be the correct version. (I selected it from the hardware list for this router.)
Device cudy-wr1300 not supported by this image Supported devices: cudy,wr1300 - Image version mismatch: image 1.1, device 1.0. Please wipe config during upgrade (force required) or reinstall. Reason: Config cannot be migrated from swconfig to DSA Image check failed.