As it currently stands, there is currently no way to hide a Watchtower notification for a weak password if the password cannot be changed. With that in mind however, I can see how this would be useful, so I've added your input to an issue we have tracking this. Thanks again!
If you're using the desktop client 8.5.0 and have set up a category for your wireless router but are experiencing issues with changing the password, it can be frustrating.
To address this, you can try accessing your router's settings through the Airtel router login page. This guide from routerctrl.com provides step-by-step instructions on how to log in to your Airtel router and make changes to your settings.
If you're still unable to change the password, it may be helpful to reset your router to its factory settings and set up the wireless category again.