Hi. I've bought Xiaomi AX3200 with installed openwrt. How can I set up Wi-fi settings or I need hard reset? Because 192.168.31.1 isn't available
The defaults for OpenWrt would be
192.168.1.1 and wifi off, so you must connect via ethernet to configure && enable the wifi. Obviously there's always https://openwrt.org/docs/guide-user/troubleshooting/failsafe_and_factory_reset - and you should both use it for a new device, as well as flashing the current OpenWrt (without retaining settings) yourself, to be sure that you get the genuine product.