Ok, here's what happened:
Whenever an update is being performed, it's important for the update to complete, otherwise, it damages the equipment. This goes for any of your equipment that needs an update. You need to take it back and tell them that the wireless is faulty. Don't tell them about the interrupted update and you won't be liable. You can exchange it for a new one. Tell them I said your wireless is not working properly. That's not a lie, because it's not working properly.
When you get your new box, move your router and modem closer to your entertainment center. I moved mine close to my TV and computer, and couldn't be happier. If it's not possible, click here
. You can use a wireless router repeater. Put this halfway between your router and Roku. It will boost the signal. You will need great signal, due to the fact that Roku only has 128 mb ram, and the buffers are limited. That repeater is for Wireless N. If your router is wireless G, get a wireless G repeater.
I suggest you get a Sony media player instead of the Roku. They are comparable in price, and the Sony works on an Android platform with 512mb ram. It has less hiccups than Roku, and it does the same thing. It has Amazon, Hulu, Netflix, PC stream, and plenty more. It also has an ethernet connection.
As far as the type of internet signal that these boxes can handle, it only matters that it is yours, and not public wimax. If you pay for the internet, and it is dedicated to you, and you control the system, it can be done. The box must have good signal to perform properly. The connection depends on your router.
Let me know if you have any more questions.