Tag: VERS | iFirmware

Contents

1. Tag Format
- 1. IMG3
2. Example Tag

The VERS tag is a string containing the target iBoot version of the image. It is unknown if this tag's value is verified anywhere in the system.

Tag Format

IMG3

String {
   0  u32   length
   4  u8[]  string      // `length` bytes long; no terminator
}
Img3VersTag {
   0  u32     magic     // 'SREV' ('VERS' in little endian)
   4  u32     fullSize  // including header and padding
   8  u32     size      // including padding
   C  String  value
????  u8[]    padding   // optional
}

Example Tag

The following tag is from the AppleLogo payload from the 2.0 (build 5A347) build for the iPhone (iPhone1,1).

Offset	0	1	2	3	4	5	6	7	8	9	A	B	C	D	E	F	ASCII
1C50													53	52	45	56													S	R	E	V
1C60	20	00	00	00	14	00	00	00	10	00	00	00	45	6D	62	65		.	.	.	.	.	.	.	.	.	.	.	E	m	b	e
1C70	64	64	65	64	49	6D	61	67	65	73	2D	39					d	d	e	d	I	m	a	g	e	s	-	9

Offset	Length	Explanation
0x1C5C	4	`magic`: When interpreted in little endian order, these bytes give the string, `VERS`.
0x1C60	4	`fullSize`: This tag is 0x20 (32) bytes long.
0x1C64	4	`size`: The actual payload (including padding) is 0x14 (20) bytes long.
0x1C68	4	`value.length`: The string is 0x10 (16) bytes long.
0x1C6C	4	`value.string`: The actual string: ``EmbeddedImages-9``.