How did you get on? I see the same thing, the website download page for V1 has a newer version that the one I currently have (that was updated in the iOS app). The iOS app isn't showing an update....

Make the device doing the Speedtest a priority device. Also play around with the QoS settings, use a custom profile and make Surfing and Downloading important.

It doesn't matter what frequency devices connect at, they all join the same network and can talk to each other. If you can't see your Google home devices then there's another issue.