Its intuitive user interface makes it easy for users to navigate through its different options and execute relevant tests quickly. The OCCT Perestroika benchmark is available in a free version and can be downloaded from their website. OTA Updates ( Over-the-Air Updates, also known as wireless updates) were introduced with iOS 5. This allows a user of a device to go into Settings > General > Software Update and download and install the latest iOS software on-device, without the need for iTunes. The device checks an XML-based PLIST file on or sends a POST JSON request to (codenamed Pallas) for updates. The updates are delivered in plain unencrypted ZIP files. There are three known versions of OTA updates. OTA update bundles contain an ist file and two folders: META-INF and AssetData. META-INF has only one file which describes bundle contents.ĪssetData contains three Bill-Of-Materials files (they can be viewed with lsbom and created with mkbom). pre.bom states filesystem before update, post.bom - after and payload.bom describes the patches to be applied during update process. 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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