I’ve done resets and the router is updated.
is it normal behavior or is something wrong?
Normal
But why are they open, isn’t it a security risk?
Dunno but mine does it so I presume it’s normal.
As soon as the router starts, the wireless driver is loaded, which is first the default SSID of the MTK closed source driver, and then the GL program is loaded and overwrite, which is your SSID.
This is normal behavior. These default SSIDs cannot be connected.