Alpine 4A57

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 restoring via a ramdisk, the restore tools appear to be right in the OS, suggesting restores were originally performed through userland.

Baseband

 * The iPhone Prototype came with 04.02.13_G

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