No Internet on phone/tablet after update

Hello. After update my Router, i cant not use the internet from my phone and tablet.

what can i do, please help.

thanks.

check that the router’s WLAN (Wi-Fi) is activated
disconnect the devices (phone, tablet, etc.) from the WLAN
then reconnect them

if this doesn’t solve the problem, reboot the router

_on the other hand, the topic of discussion concerns the updating of Android TV boxes~

_and has nothing to do with the router~