uhm, some direct link for the right 21.02 sysupgrade.bin?
by the way, I do not need last openwrt (it is in rc4…), last stable may be ok for me.
So I should connect both WAN (for poe) and LAN? Maybe I have to connect both WAN (with main router) and LAN (with my pc, directly) for config, than using only WAN. In this case I just have to add a firewall rule to allow incoming traffic from my lan devices to ar150 WAN, tcp/udp port 80.