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ZiPhone
Zibri's tool to unlock, jailbreak, and activate.
It makes use of the Ramdisk Hack and uses geohot's BL4.6 Minus 0x20000 with Back Extend Erase to downgrade the bootloader and subsequently unlock the baseband.
While the simplicity of the tool made it very popular, accusations of plagiarism and worse were leveled at Zibri. His name, and that of the program, have become mired in controversy.