I have the latest firmware, L2R.1.3A.
I could not get the built in wireless to connect reguardless of my settings. Here is all what i tried:
Disabled wireless encryption entirely
Disabled firewall connection on my Belkin
DHCP IP address
Static IP address
Changed the channel
Checked the antenna connection inside the unit (it was connected).
Power cycled the unit.
Was on the phone with support for 2 hours trying various things to no avail.
Finally gave up on the internal wireless, went to Walmart and got a NetGear WNCE2001 "Universal Wireless Adapter", $59, hooked that up. Got it working in less than 5 minutes with full WPA2 encryption, zero issues.
There is a nice dimple in the top of the case of the Blink where the network and power cable for the Netgear can be routed. I was able to route all the cabling inside the unit so the wires are all hidden.
My advice is that if you cannot get the wireless to work, get one of these Netgear WNCE2001s. They are tiny, setup was simple and worked the first time. Figure the DOE gave you a $2000 EVSE installed for free, I can certainly afford to spend the $59 to get a reliable wireless connection...