If you have an mcpx 1.0.bin file on your hard drive and you compute its MD5, one of two things will happen:
When a physical Xbox powers up, the CPU begins execution inside this internal 512-byte space rather than reading directly from the external Flash memory chip (BIOS). The primary roles of the MCPX v1.0 code include: md5 %28mcpx 1.0.bin%29 = d49c52a4102f6df7bcf8d0617ac475ed