can't connect wireless, but working in wire, with orange security light

[madeinchn]

I have been using my Buffalo for years,
AirStation Nfiniti Highpower Giga
Firmware: DD-WRT v24SP2-MULTI (07/09/12) std

but suddenly can't be found as wireless.

But I can still connect to it with wire, and the network connection with wire is working.

I've tried rebooting for multiple times, and renamed the wireless name, etc, but still not working.

One clue is that:  the security light is orange, (I didn't remember what it was before). After i pressed AOSS key on the side of the route, the security light started to twinkle.

Not sure any setting related to security.

[davo]

First reset it