Сообщение от https://www.psdevwiki.com/ps3/Custom_render_plugin
The anim_gameboot used from firmware 1.00 up to 2.80 was loading the sound files: gameboot_stereo.ac3 and gameboot_multi.ac3. These files were removed in firmware 3.00 and are not present in newer firmwares.
На кастомках есть отдельный патч возвращающий эти файлы.