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.