Right after you turn it on it flashes the current version on the remote control screen, and the headphones it more abbreviated but it shows there, too. You want v5.21 because it fixes a battery drain on the headphones assuming you have wireless phones, otherwise you can use v5.2.
It's easy to download a another version. One thing I don't like their instructions says to plug in the coil. I think they mean make sure it is charged. i did not leave my coil plugged in to the charger when downloading.
Yeah, I’m searching for a pc not hooked up to a firewall as I write this. We have some fast and efficient pc here in Windows at work. But have a very strict firewall