I upgraded to 2.09NA successfully. My main wireless already had 20Mhz. Security WPA-Personal. I changed it to WPA and TKIP like you said. No luck. I'm trying guest zone with no password. Doesn't work.
On my main network I have it set to invisible, so it shouldn't show up if neighbors scan. So, I manually enter it in my phone and my password. Connects right away and works great.
I don't know what happened, but scanning in my phone it finds a connection marked "yuppicide". Weird. I never set anything up with that name. I connected, but could not browse the internet. So, I turned off guest for now, because I got worried. yuppicide is no longer seen.
Wireless is weird. Now, I live on a dead end street in the middle of the woods. I used to see the lady across the street's wireless. I know it's hers because it had her name on it. Now she doesn't show up.. maybe she renamed it.. whatever.. but what's weird is one called c3xt5 or something just showed up and is gone now.. someone named madu showed up earlier today and is gone.
There is one that is marked xfinitywifi with excellent strength, but it won't let me connect. Good thing. I bet it's me. I have Comcast and recently got a DOCSIS 3.0 modem, which came with wireless in it. Comcast does not allow you to go into settings, so I called Comcast and they shut off the wireless for me. I told them I already have a d-link and I was worried I didn't want neighbors mooching off me.