This is my gameyob config file for use, but you can only choose one bios. GB or GBC bios. (There is no bios file, you need to find it)
after loading a GB/GBC game you can access the settings by touching the touch screen, select bios and save settings or Or put the bios as it is already configured "biosfile=sd:/data/GBC/gbc_bios.bin"
*To edit the configuration file just click with the right mouse button and use the "edit" option
**Using the GBC bios allows you to use the Gameboy color palettes
View attachment 387948