IMG4 File Format

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Revision as of 14:22, 26 December 2013 by M2m (talk | contribs) (Correction - /user/standalone/firmware has the IMG4 file, IPSW file has the IM4P file)
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There is an img4 file (sep-firmware.img4) found in /user/standalone/firmware on 7.0.4 for the iPhone5S. 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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