Can’t do Firmware update

> I can't pull up the website and do the firmware update. Safari and
> Firefox won't load the site. [...]

   _Which_ "the website"?  "can't" or "won't" is not a useful problem
description.  It does not say what you did.  It does not say what
happened when you did it.  As usual, showing actual actions (commands)
with their actual results (error messages, LED indicators, ...) can be
more helpful than vague descriptions or interpretations.

> [...] when I load the Netgear page that is the instructions [...]

   Thanks for the helpful link.

> [...] only Netgear models listed can be updated and my model is not
> listed.

   I know nothing, but I wouldn't expect the procedure to vary much
among extender models.