Where to get previous versions of iOS disk image? [closed]

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开发者_JAVA百科

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I just became a member of iOS Developer Program and I'm reading the document iOS Developer Program User Guide. It says:

1. Download the iOS Disk Image (.dmg) from the iOS Dev Center for the Apple device you are using.

Well, in my Xcode Organizer, I can see two versions: 4.2.1(8C148) and 4.3.2(8H7). Suppose I want to test my application on previous version of iOS, say 4.0 or 3.x. Where can I find/download the iOS Disk Image(firmware) as the document says?

Thanks.

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Apple has made it difficult to downgrade firmwares on iOS devices. Once you upgrade past 4.2.x (I think), you may not be able to go back. Nonetheless, you might go here for older firmwares.

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you mean the firmware's IPSW ? Google has some good results:

http://www.iphoneheat.com/2009/03/download-iphone-firmware-files-all-at-one-place/