iOS 4 - Wikipedia
iOS 4 is the fourth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iPhone OS 3. It was announced at the company's Worldwide Developers Conference on June 7, 2010, and was released on June 21...
iOS 4 | Apple Wiki | Fandom
iOS 4 (codenamed "Apex") was the 4th major release of iOS designed and developed by Apple for the iPhone, iPod touch and iPad, being the predecceesor to iOS 5 and the succeesor to iPhone OS 3. It was for the iPhone 3G or later, iPod Touch...
iOS 4 review | iMore
iOS 4 (previously iPhone OS 4.0) continues Apple's relentless yearly mobile OS update cycle. If 2007 was the mainstreaming of the multitouch user interface, 2008 all about the...
iPhone OS 3.1.3 was the last iOS software update for iPhone 2G (the original Apple introduced folder management back in June this year with the release of iOS 4. The...
The latest articles about iOS 4 from Mashable, the media and tech...
iOS 4 is here, and it rocks. If you haven't yet had a chance to upgrade your device -- or you're waiting until later this week to get an iPhone 4, we've got a full walk-through of the new version of iOS and its...
Download iOS Firmware for iPhone, iPad... / IPSW Downloads
Download current and previous versions of Apple's iOS, iPadOS, watchOS, tvOS and audioOS firmware and receive notifications when new firmwares are released.
iOS 4.2 Direct Download Links
You can download iOS 4.2 directly from iTunes 10.1, but if you'd prefer to use a direct download link, here they are from Apple
iOS 4 | The iPhone FAQ
Unfortunately for some iPhone 3G users the iOS 4 update did not go very well. Reports have surfaced that the new firmware has problems running on the older hardware.
Download iOS IPSW files for iPhone 4 (GSM) / IPSW Downloads
Unsigned IPSWs. ✗. iOS 7.1.1 (11D201). iPhone3,1_4.3.5_8L1_Restore.ipsw. ✗. iOS 4.3.4 (8K2).
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