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IMG4 File Format
There is an img4 file (sep-firmware.img4) found in /user/standalone/firmware on iOS 7.0.4 for the iPhone 5s. The IPSWFILE/Firmware/all_flash/all_flash.DEVICEIDENTIFIER.production for any A7 (64 bit) device containts an IM4P version of the same file. It has a IMG4 header, but also refers to IM4P File Format.
Header
uint8_t ??; //0x30 uint8_t lengthOfSize; //0x83 = 3byte, 0x84 = 4byte 3,4 byte sizeFromHere; //Size of Image uint32_t delimiter; //0x1604 uint32_t magic; //IMG4
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