Bootanimation is the Xbox loading animation showing at bootup of the console.

The file is stored in XBFS as bootanim.dat.

It uses a proprietary format, likely specific to the AMD GPU.

File format

The file starts with a section header (BOOTANIM_SECTION_HEADER) and then followed by unknown data of size Header->SectionSize.

If the following data starts with the header magic, an additional section follows.

BOOTANIM_SECTION_HEADER

Offset Length Type Information
0x00 0x04 uint Magic (FSEG)
0x04 0x04 uint SectionIndex
0x08 0x04 uint SectionSize

BOOTANIM_DATE

Offset Length Type Information
0x00 0x?? ?? Unknown