- the actual cpio patch archive (encrypted).These updates do not contain payload.bom file and are deprecated. ist file from AssetData folder contains PackageVersion field which can be 1.0, 2.0 or 3.0. 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. pre.bom states filesystem before update, post.bom - after and payload.bom describes the patches to be applied during update process. 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).
OTA update bundles contain an ist file and two folders: META-INF and AssetData.
There are three known versions of OTA updates.
The updates are delivered in plain unencrypted ZIP files. The device checks an XML-based PLIST file on or sends a POST JSON request to (codenamed Pallas) for updates. 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. OTA Updates ( Over-the-Air Updates, also known as wireless updates) were introduced with iOS 5.
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