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When an internal restoration file (often an internal build containing custom diagnostic suites) is fed into the system, developers select custom kernel types:
: You provide the path to the folder containing essential boot files like LLB, iBoot, and IMG3/IMG4 files. Ramdisk Image
Historically, Apple relies on user-facing applications like Finder or Apple Devices to restore retail iOS hardware. However, internal development requires far more granularity. RestoreTools.pkg is a macOS installation package that deploys a suite of low-level diagnostics, debugging, and flashing utilities directly to an engineer's Mac.
For engineering teams working with prototype hardware or specialized firmwares (such as NonUI or InternalUI builds), the restoration environment requires strict manual parameters. The new workflow relies on pairing RestoreTools.pkg dependencies with an authorized restore bundle:
Use the official Apple Support guide to update or restore your device.
If you attempt to install an older iteration of RestoreTools.pkg on modern macOS versions (such as macOS Mojave 10.14.4 and later), the operating system blocks the installation.
