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IMG4 File Format
There is an img4 file (sep-firmware.img4) found in /user/standalone/firmware on 7.0.4 for the iPhone 5s. The IPSWFILE/Firmware/all_flash/all_flash.DEVICEIDENTIFIER.production for any A7 (64bit) device containts an IM4P version of the same file. It has a IMG40 header, but also refers to IM4P File Format.
The IMG40 structure is as follows:
sequence [ 0: string "IMG40" 1: string encryption type - IM4P 2: string type - sepi (Secure Enclave Processor Image), ... 3: ... ]
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