Alpine 4A57

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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.
Engaging in illegal activity is not condoned. This information is provided for educational purposes only.

Alpine 4A57 is a prototype firmware found on an iPhone Prototype discussed on macrumors. According to a photo of it, it was a prototype for 1.1.3.

Restore

Instead of it being done through a ramdisk, the restore tools seem all to be right there in the OS, I guess because they originally did restores through userland.

Baseband

Flashing 04.02.13_G on a retail iPhone can be done with bbupdater, but results in loss of Carrier Network connectivity.