RT-AC51U led indicators questions

Dear All,

i have an Asus RT-AC51U with LuCI openwrt-23.05 branch (git-23.236.53405-fc638c8) / OpenWrt 23.05.0 (r23497-6637af95aa) installed.

I configured radio0 (5.180Ghz) and radio1 (2.412Ghz), tested both and is working.

By the device, i have power led on and 2.4Ghz and port 1 leds flashing.

5 Ghz led does not ligh, indication it's on.

I'm connected to the radio0, no problem.

Any idea why not?

Thx in advance.