Debranding an ATT c905a

I have an American ATT version of the SE c905.

When I got it I tried rebranding it so I could get WiFi, which ATT turns off, and to get rid of MediaNet. Here are the settings after rebranding:

Current software version:
1211-0564
R1BA034
081002
SonyEricsson

I got rid of MediaNet there is still no WiFi option and I'm confused what to do next.

Do I need to upgrade to a later version of firmware?

There's a generic R1FA035 main available in Downloads, but no generic FS. Where do I find a generic FS?

Am I missing something else? Thanks for any suggestions.

EdB

First of all, you need to know what CID is your phone. Identify it with A2Uploader_CID53.