I've configured my Xiaomi Mi router 4 as simple Access Point (openwrt 22.03.5).
It used to work except that sometimes, DHCP (relayed from this box to the DHCP master server) stopped to work. I had to power cycle the Xiaomi box.
I suspected that this was caused by the LAN interface on this box configured as DHCP client to get its internal IP so I changed the configuration to set as static IP.
After rebooting the box, the box still works as Access Point but impossible to connect on the static IP I've set (https/http nor ssh). ping the box doesn't answer.
Do you know how I could get back the access to the admin interface on this box please ?