PS3 - [Research] Modifying the Coldboot/Gameboot Sequence (custom_render_plugin.sprx/rco) | PSX-Place
PS3 - (TuT) Make your own coldboot logo and sounds | PSX-Place
PlayStation 3 / Video Examples - TV Tropes
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For those who asked how I did it, OG Gameboot/coldboot step by step tutorial! (Enjoy!) : r/PS3