Flashing the wrong image will hard-brick the console.
mcpx2bios --mcpx mcpx.bin --bios original.bin --output combined.bin
Because of copyright, we cannot host or link directly to files. However, the following sources are widely used in the repair community:
The only strictly legal way to obtain this file is to extract (dump) it from your own physical Xbox console using specialized tools. File Verification (MD5 Checksums)
Use tools like mcpx-attack and a Cromwell-based BIOS payload.