Gameboy Color Startup Change

[DroRox]

Okay I've never seen this being done before so I'm wondering if its possible.
Is there any way to change the gameboy color animation that appears whenever the handheld is turned on into a different animation?

Reaon I ask is because I gave my GBC a really sick paintjob to make it look like BMO from adventure time and it would be cool if i could change
the animation to BMO's face haha

 

[Deleted-236924]

Do you know how to edit the bios?
No?
Good luck then.

 

[indask8]

I remember a webpage of someone who managed to dump the SGB/GBC bios

but anyway it's read only, and it wont be easy to read/replace since it require like hundreds of wires to dump it... ( I'm pretty sure the bios is actually inside the custom cpu chip made by nintendo).