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Locate the bios.iso at the install directory of the SwitchNX emulator (C:\Program Files (x86)\SwitchNX - is default location) after that run/restart the emulator, and it will auto detect the bios.iso
To play Nintendo Nintendo Switch games on your PC you need the emulator, and you need a Nintendo Switch BIOS, put the BIOS inside the map with the emulator.
And you will be able to run the Nintendo Switch roms with the emulator.