@justine
I'm kinda surprised very few people do this, it's really cool and in a lot of cases not that hard β most of my laptops have custom boot logos, and some phones too.
I have to admit though that with my Android phone positioning was kinda tricky because I wanted the firmware logo to match the boot animation and be in exact same place as it is in the wallpaper in running OS β took me the whole evening to make it perfect π