IOS4 on 3GS - No WiFi

Yesterday I have installed iOS4 GM on my 3GS (running 3.1.3). I collaborate with two iPhone/iPad developing teams so I have access to the ADC pages for downloading iTunes 9.2 and the GM seed.
Everything went as planned but once the restore and sync finished I noticed that the WiFi field in Setting was grey out. I went to General/Network and also there it was grey out. No on/off switch.
I tried another restore. Same result. I have reset the network. Nada.
All the rest of the network connections work properly, including bluetooth.
I exclude an hardware issue because right before the installation the WiFi was working perfectly. I have searched in various forum but it seems I am the only one with this problem. Any idea?

I have problem with WiFi too. After upgrade to iOS4 (3GS) AP is connected, IP addr. obtained. On WiFi configuration tab everything seems OK, but no wifi communication (no wifi icon on display). Second thing - with (non working) wifi turned on, about 40% of battery is drained during 1 hour.
Any suggestions?
Thanks

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IOS4 on 3GS - No WiFi

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