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Baseband Bootloader
This is responsible for updating the baseband
3.9
This is the old bootloader from the iPhone/S-Gold 2. It is vulnerable to Minus 0x400 and IPSF
4.6
This is the new bootloader from the iPhone/S-Gold 2. It is vulnerable to Minus 0x20000 with Back Extend Erase
5.8
This is the bootloader from the iPhone 3G/X-Gold 608. Currently it has no known exploits. It is also sig checked.