Why can't I access hidden webpages within my modem?

> [...] I did a small scan on the modem itself [...]

   That was tantalizingly vague.

> [...] was able uncover these pages however when I navigate to them
> it's a blank white page [...]

   Perhaps that's because they're not (whole) web pages.  You might as
well ask why you can't drive your car's oil filter down the street by
itself.  It works as part of the whole car, not on its own.

   I would expect any ".gif", ".jpg", and ".png"/".PNG" images to be
displayed, however.