Bootrom Dumper Utility

Credit

Pod2g

Geohot for limera1n

Info / Instructions

• you need a mac or linux box to use it / build it
• libusb > 1.0.8 required
• execute it with root privileges (sudo ./bdu)
• by default compatible only with A4 devices: (iPhone 4, iPod 4G, iPad, AppleTV 2)

It's possible to extend the compatibility to older devices as well (iPhone 3GS, iPod 3G) by changing:

• the offset to the call of usb_wait_for_image in payload.S

0x7ef  @ A4
0x30E9 @ iPod 2G, old bootrom
0x8b7  @ iPod 3G, iPhone 3Gs new bootrom 

• exploit offsets in bdu.c

// A4:
#define EXPLOIT_LR 0x8403BF9C
#define LOADADDR_SIZE 0x2C000
// iPod 2G:
#define EXPLOIT_LR 0x22000000
#define LOADADDR_SIZE 0x24000
// iPod 3G:
#define EXPLOIT_LR 0x84033F98
#define LOADADDR_SIZE 0x24000
// iPhone 3Gs new bootrom:
#define EXPLOIT_LR 0x84033FA4
#define LOADADDR_SIZE 0x24000

Links

Github