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As we expected the 2.0.1 firmware was still buggy like 2.0 and since yesterday night, Apple offers firmware 2.0.2 for iPhone 2G and iPhone 3G. They claim this firmware version solves UMTS/3G issues for iPhone 3G users. Besides that information Apple don’t tell anything.
As we investigated a little: customers who already installed this new firmware still encounter 3G connection problems (see Apple’s forum here).
As we’re not aware if there are any advantages for 2.0 and 2.0.1 users: we recommend not to update now. We will get back to you with more details, once we tested 2.0.2 carefully.