> I do not know which version I have. [...] There is no serial number.
Is there a product label with a "Model" field?
Visit http://netgear.com/support , put in your model number(s), and
look for Documentation. Get the Reference/User Manual(s). Look for the
basic how-to stuff on using a web browser to manage the thing(s), and
see if you can discover its actual/complete model number some place on
its/their management web site(s).
> I have just learned that the only difference is the firmware. [...]
You "learned" this how, exactly? I've never touched one, so I know
nothing, but I'd guess that if the only difference between these
hardware versions were firmware, then there would not be two hardware
versions. More likely, the "v2" variant is a different design, which
was cheaper to manufacture than the "[v1]", but has the same general
feature set. Because of the hardware differences, they use different
firmware.
> [...] So now I need to know what version of firmware I need to update
> the modem. [...]
You might start by trying to discover which firmware version you have
now.
> Is it possible that the download can be determined by download site?
"determined"? Generally:
Visit http://netgear.com/support , put in your model number, and look
for Downloads. (For older versions, under Firmware and Software
Downloads, look for "View Previous Versions".) Find the kit(s).
Download the kit(s) you want. Read the "Release Notes" file for
instructions. (In the User Manual, look for "firmware", and,
especially, for a topic like "Manually Upload Firmware to the Router".)
The firmware version numbers for these two different devices look
different. If you can find your current firmware version, then you
might be able to deduce your hardware variant from it.
