flash by using the fastboot command:
fastboot flash clogo <filename.bmp>
while in bootloader mode.
Attached is 4 previews and then a zip with 25 logos in it.
I own nothing. I just made flashable some flashable bmp.
JUST TO BE 100% CLEAR THE CLOGOS.ZIP IS NOT FOR FLASHING. IT CONTAINS THE BITMAPS TO FLASH WITH FASTBOOT.