Hi @jennyjenny 

Does your tv box have the latest software/latest update?

The zyxel modem only supports WPA2-PSK as wifi encryption. Maybe your tv box doesn't support WPA2-PSK. The only option then is to connect another router or repeater to your zyxel and disable the wifi of your zyxel modem.

@Waqqas 

Thank you so much, (could be, as it is quite old 3 years ago,and it was compatible with other router I had)

I dont have any router at the moment to test; is there a way to disable WPA2-PSK setting in admin for this Zyxel?(setting)

if I get another router (new one) I will probably have the same issue (correct?) How about connecting with cable (it’s not ideal solution but do you think I will have same issue?)

@jennyjenny 

Connecting via cable should work, I don't think a moderator can change the wifi encryption unfortunately..

@Waqqas so I will need to get a older (router ) which is not using WPA2-PSK?

@Waqqas Big thanks to you! it is the exactly the reason, so, I connect to another Router and it works...thank you so so so  much!