AppleLogo

The AppleLogo is located at  in the IPSW, the Apple logo is flashed to NOR (or a functionally equivalent partition) and displayed at boot time. If the boot-arg  was enabled, it will eventually appear over it.

It is a PNG picture with an alpha channel packed into an IMG3 archive.

Due to limited firmware storage space, any custom boot logo must be exactly 320x4801 and under 100 kB.

1Custom boot logos are not supported on devices not vulnerable to 24kpwn or Pwnage 2.0. For a possible alternative, see animate.