Baseband Device

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This is the device in the iPhone that manages all the functions which require an antenna. The baseband processor has its own RAM and firmware in NOR flash, separate from the ARM core resources. The baseband is a resource to the OS. The Wi-Fi and bluetooth are managed by the main CPU, although the baseband stores their MAC addresses in it's NVRAM.

The iPhone's baseband processor is the S-Gold 2. The iPhone 3G and the iPhone 3GS make use of the X-Gold 608 chip for this purpose.

You can check some Baseband Commands too (by pH and EvilPenguin)


This is the area in the baseband where the lock state is stored.


0x400--NCK token
0xB10--IMEI signature
0xC00--Locks table


Many of the sections are encrypted using TEA based off the CHIPID and NORID. See NCK Brute Force for more info.


Theoretical Attacks

Boot Chain