IPhone 3G iOS 4.2.1 Wi-Fi not working

Ok so I got my iPhone working finally, it is not registered to any phone provider. Now when I try to connect to wifi, I enter the correct password, and it say you have entered the inncorrect pasword for all the networks I have tried to connect to. It is not like this on my iPod Touch 2G, my iPad 2, my other iPhone 3G, and a friends iPhone 3G ( all running on ios 4.2.1.) Just a reminder all my devices are jaibroken, including my friends iPhone. I really need help with this issue. Also all 4 networks work on all my other iDevices are connected to these networks no problem, but the wifi doesn't work on this iPhone 3G. Any suggestions on how to fix this? The Wi-Fi Adress is 00:26:4A:42:BA:EF.

Brother Just Follow This
You Reset the Networking Setting In Iphone
if Same Problem then Just Downgrade to 4,1 Firmware then Again Same
Last Thing is that Re hot the Wifi Chip

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