Trying to access router returns an 404

I cant access my router anymore trough the default gateway. I know it has worked before, when i have port forward it so i could play with friends. but then it suddenly stopped working and just gave me an 404 each time i try to access it.

I'm relative tech savvy, and have searched around the internet for answers, but so far i haven't found anything yet.

I have an Technicolor router, i know the default gateway is correct, it pings fine, i have access to internet, its just accessing the admin pages don't work. I have tried turning it off and on again, power cycle.

I have tried factory resetting it once i think, im not sure if i did it correctly after reading on Technicolors website, i only held it down for 30 sec, but its the last thing i want to try again, so if anyone has any ideas, it would be great to get this fixed