After SYS upgrade, unable to access WIFI

Development Tools IDE 1.x
1

I followed the instructions on the http://arduino.cc/en/Tutorial/YunSysupgrade page. The process appeared to complete correctly. Except that I can no longer gain access to the device via the network. http://192.168.240.1 says it is connecting..... and then it fails for no WEB page available. http://192.168.1.151 (I originally had it set to this static IP) returns with the "Wait a minute or click here" screen and then fails to WEB page not available.

The file loaded was
openwrt-ar71xx-generic-yun-16M-squashfs-sysupgrade.bin

I tried holding the WLAN rst pin for > 30 seconds. No help.

I am able to load sketches. I only tried the blinking one, since the WIFI/bridge seems to be an issue.

How do I recover from this condition?
Since my YUN was less than 1 week old did I really need to upgrade it?

Thanks,
-Phil-

2

A clarification:
I am able to program the board via the serial port, not via WIFI.
-Phil-

3

It was not clear to me (but in hindsight it should have been) that the upgrade would require that I revert to the initial bring-up steps. I assumed that the WIFI would remain configured. Backing up all the way to the Getting Started page and working my way through appears to have resolved the issue.