You favor to go for a restoration or only a first so that you can transfer to iOS 5 (on this case, the beta 6 )? On this case, you are going to want the whole firmware and multimedia device from AppleiTunes in its model 10.5 beta 6 to cross the act. Chiefly, be sure you are registered to a developer account! However, the hyperlinks are already on hand.
Here are all the direct download links:
iPhone 3G
iPhone 4 (GSM)
iPod touch 3G
iPod touch 4G
an iPad (WiFi)
iPad 2 (WiFi)
iPad 2 (WiFi + 3G)
iTunes 10.5 Beta 6 Mac OS X
iTunes 6 10.5 Beta 32-bit Windows
iTunes 10.5 Beta 6 Windows 64-bit
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