![]() It also contains boot folder where bootchain-related files are stored (iBoot, kernelcache, etc.), payloadv2 or payload (depends on PackageVersion value of AssetData/ist file) and ist file which describes the update. ist file from AssetData folder contains PackageVersion field which can be 1.0, 2.0 or 3.0. ![]() the actual cpio patch archive (encrypted).These updates do not contain payload.bom file and are deprecated. asymmetric signature of ist validated against /System/Library/Lockdown/ a list of BSDIFF40 patches and baseband firmware updates, if available, with the associated flashing tools (bbupdater/imeisv). Libupdate_brain.dylib - stage 2 update process library (encrypted).Īll updates with 2.0 package version have payload folder inside AssetData instead of file from 1.0 updates. It contains only two folders: added folder with unencrypted files which are to be added during update process and patches folder.
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