Write feedback tplink support team and see if they can improve it.:-)

All the wireless will show up in Advanced > Wireless > Statistics, are they listed there? If you switch from 5G-1 to 5G-2, will it disappear from the list? Can check the interface on other web...

Did you try reset and reconfigure the modem? It seems the modem died since you cannot even log into the interface. Can contact TP-LINK support and see what's happening on the modem. Call the 24*7...

I guess your router is bricked. Not sure what the warranty policy is in Pakistan, but usually you can contact the reseller/distributor to get it replaced if router is under warranty.

There is a wifi butom on the back, try pressing it for 2~5 seconds and check if the WLAN lights up or not. On the Interface setup > Wireless configuration page, make sure the Access Point is...

Agree with MikeX. Your router seems to be a localized version, it's better to contact the local support team in Germany if they have a beta firmware to try or what.