i don't know about that particular model, but on my voyager 2500v you can upgrade the firmware from within it's web interface. have you checked all through it's options.
also bear in mind newer doesn't always mean better. i stupidly upgraded the firmware on mine and i find it grinds to a halt after being on for 10 days or so and needs a reboot. with the original firmware i could leave it on for months at a time....