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The Xbox 360 system uses a series of bootloaders to load the hv/kernel and dashboard. These loaders are explained at Boot Process.

Header

The header is at the start of the bootloader and is usually 0x20 bytes long.

Offset Length Type Information
0x0 0x2 ASCII characters Loader name
0x2 0x2 unsigned short Loader build number
0x4 0x2 unsigned short Loader pairing data
0x6 0x2 unsigned short Loader flags
0x8 0x4 unsigned integer Loader entrypoint
0xC 0x4 unsigned integer Loader length (including header)
0x10 0x10 bytes HMAC salt (used for decrypting the loader)
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