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This article discusses software internally used by Apple. Acquiring a copy without Apple's consent is illegal and may result in being scammed. |
This is a documented list of Internal Firmware types:
- InternalUI Builds, which are Development/Debug builds of *OS
- NonUI builds, which are for Factory and Development testing of *OS devices.
- CarrierOS, which are meant for Carrier Testing.
- Horizon Firmware, which are stripped-down NonUI builds to recalibrate parts for iPhones.