Firmware update failed, Ethernet port is not functional

> [...] I attempted to update the firmware on the router. [...]

   "attempted" how, exactly?

> [...] There was a problem with the update. [...]

   Thanks for that detailed description.

> [...] Now I cannot connect to the internet [...]

   What happens when you try?

   A vague description of what does _not_ happen is less useful than a
clear description of what _does_ happen.

   "cannot" 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.

> [...] as the ethernet ports are not functioning.

   Says who?  Evidence?

> IMG_2596.jpg

   Three of the port-status LEDs in that picture look happy enough to
me.  The Internet LED shows a problem, but not necessarily an Ethernet
port problem.  To what is the router's WAN/Internet port connected?  Is
that (unspecified) device happy?

> [...] I can connect to the router via wifi. [...]

   So, _you_ can see the current firmware version?  (With my weak
psychic powers, I can't.)

> [...] How do I manually update the firmware without using the ethernet
> ports.

   Use a computer with a wireless connection?  The procedure's the same.
An Ethernet connection is generally considered to be more reliable, but
if your "the ethernet ports are not functioning", then I might try to
use what was.  Before I got too excited, I might try the basic stuff:

   Visit http://netgear.com/support , put in your model number, and look
for Documentation.  Get the User Manual (at least).  Read.  Look for the
LED descriptions and "Troubleshoot".  Further reading might not hurt,
either.