AX1800 Can't access web admin interface

Hey, I've had a Flint for over a year now and never had any issues but last night I attempted to access the web admin panel through 192.168.8.1 and got the unable to connect error page in firefox. I haven't done anything or changed anything but can suddenly no longer get to it. I don't have the goodcloud app either so I'm currently locked out of the router (it still works fine, just the admin page which is having issues) Any help or advice would be appreciated. Thanks

Hello,

Here guide to refer please: