У вашего броузера проблема в совместимости с HTML5
The Cisco SG300 switches are pretty decent (I've installed about 250 of them in their 10MP, 28, 28P and 52 guises) but we've had a handful which have stopped booting up, possibly following power spikes.
This one was plonked on my desk today, so I took it home to fix it. It's an easy one...