After 4.2 update cannot connect to internet

Having just updated my Airport Express with the latest update 4.2 I now seem unable to connect to the internet. Yet when I the Ethernet cable directly into my powerbook, no problems. I've run the assistant countless times, Ethernet cable connected, unconnected, completed a hard reset and re-started everything. When I check the Airport Admin Utilty, all the information for my ISP has been detected by the unit and is visable and the second Express unit with printer and speakers seems unaffected. Is there a glitch in the update???

Cheers Paul, for the advice.
I tried but without any luck. Finally I decided to take the advice of NigelReves1 (Topic:airport 4.2 update...no Internet (negotiating PPPoE) Message 7.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1
Downloaded "Binary File" (see link) to desk top and uploaded using the Airport Admin Utility. This puts Airport back to it's 'box like' state. Did a hard reset on both units, run the Assistant and I am delighted to say...It's all systems go!!! So a big Thanks to Nigel!!!
http://www.apple.com/support/downloads/airportexpressfirmware60.html
Anyone trying this, don't be tempted to click OK when you see the prompt 'There is a newer version of software available 6.2'! Otherwise you'll be back where you started!!!
Mark

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