Baseband firmware files have been codenamed Trek, ICE, and MAV.
.bbfw file format is a ZIP archive containing
Options.plist, and multiple firmware files. In the past, these were EEP and FLS files, the external EEPROM and firmware, respectively. In modern iOS versions, these are
For example, the iPhone 4 has a single baseband firmware file. The 4.0 baseband firmware filename is
ICE3_01.59.00_BOOT_02.06.Release.bbfw and contains contains four baseband firmware files.
Known MBN Files
The main identifying document for a given Baseband firmware is its
Info.plist. This PList contains the Build, ChipID, RestoreSBLVersion, SBLVersion, and Baseband Version of the firmware.