Can't update Dell wireless 3300 adapter firmware to use WPA

I have 3 of these print servers. One of them I was able to connect to WPA, and the two other won't. I found out that those two have N201 firmware than the one that can connect to WPA has N203 firmware, so I want to update the other two firmware. But when I type the ip address and go to the webpage to update firmware, it says it needs java. So I tried many browsers and follow some articles to use add-in for java but nothing works. Just wondering if there are other ways to update the 3300 someone might know of.