To understand "bios wii dolphin," we must first separate two types of low-level system software.
Graphical glitches in Dolphin (e.g., missing shadows, bloom) are caused by inaccurate GPU emulation settings or game-specific hacks. They have zero relation to BIOS or NAND. Adjust your graphics backend (Vulkan, OpenGL, Direct3D 12) and enable "Store XFB Copies to Texture Only" to fix those issues. bios wii dolphin