GL-MT300N-V2 unable to be repeater for wifi network channel 13

Routers
2

You can ssh to the router and change the wifi settings.

For Japan you can use up to channel 14.

uci set wireless.mt7628.country='JP'
uci set wireless.mt7628.region='5'
uci set wireless.mt7628.channel='13'
uci commit wireless
wifi