You need to place the custom BIOS for CxbxR2 and Copy/Extract it to the emulators install directory. (Default install directory is C:/Program Files/CxbxR2)
The Xbox One custom BIOS for CxbxR2 is not included with the emulator for legal reasons.
Download CxbxR2 bios files:
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Download the bios file(s) and place them in the home directory of the emulator. Then restart and it will load the bios automatically.