so far there is nothing in the manual that is helpful

you guys have actually told me more than it does. As a matter of fact there is only one sentence about upgrading firmware...
I'm actually pretty disappointed by how little info this manual actually provides. It has actually left me with even more questions.
In the manual under "basic Wireless settings" it says:
Wireless Network Mode. From this drop-down menu, you can select the wireless standards running on your network. If you have both 802.11g and 802.11b devices in your network, keep the default setting, Mixed. If you have only 802.11g devices, select G-Only. If you have only 802.11b devices, select B-Only. If you do not have any 802.11g and 802.11b devices in your network, select Disable.
This is all it says about this and I have no idea what it means. My computer is the only one using this router. on the sticker it says 802.11
n Wireless. I currently have it on "mixed" (the default). Does this mean I should change it to "disable"? What is "n"?
I still can't upgrade the firmware

I lost connection again for awhile too.