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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. The A4 was the first SoC Apple designed in-house, as the processors for the first 3 iPhone models were designed by Samsung instead. 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 (that being the 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) and fourth generation iPod Touch were discontinued earlier than the iPhone 4, with the former last receiving iOS 5.1.1 on May 7, 2012 and the latter last receiving iOS 6.1.6 on February 21, 2014, despite the latter’s variant of the A4 having a slower CPU clock speed. The last operating system update Apple provided for an Apple TV containing an A4 (that being the second-generation Apple TV) was Apple TV Software 6.2.1, which was released on September 17, 2014.
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