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The Apple A4 is a 32-bit package on package (PoP) system on a chip (SoC) designed by Apple Inc., part of the Apple silicon series, and manufactured by Samsung. It was the first SoC Apple designed in-house. The first product to feature the A4 was the first-generation iPad, followed by the iPhone 4, fourth-generation iPod Touch, and second-generation Apple TV.
The last operating system update Apple provided for a mobile device containing an A4 (iPhone 4) was iOS 7.1.2, which was released on June 30, 2014 as it was discontinued with the release of iOS 8 in September 2014.
The iPad (1st generation) was discontinued earlier than the iPhone 4, the fourth-generation iPod Touch or with the release of iOS 5.1.1 on May 7, 2012, despite the forth-generation iPod Touch shares similar hardware as the first-generation iPad, but with slower CPU clock rate, and received iOS 6 update.
The last operating system update Apple provided for an Apple TV containing an A4 (second-generation Apple TV) was Apple TV Software 6.2.1, which was released on September 17, 2014.
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