The MCPX is a custom ASIC (Application-Specific Integrated Circuit) designed by Microsoft and Nvidia for the original Xbox. Inside this chip sits a tiny, 512-byte "Hidden Boot ROM."
<rom name="mcpx_1.0.bin" size="262144" crc="F1C5BE83" md5="d49c52a4102f6df7bcf8d0617ac475ed" sha1="..."/>
Expected output: d49c52a4102f6df7bcf8d0617ac475ed md5 %28mcpx 1.0.bin%29 = d49c52a4102f6df7bcf8d0617ac475ed
: This 512-byte hidden ROM is the very first code the Xbox CPU executes. It sets up the processor's initial state (GDT, 32-bit mode) and decrypts the second-stage bootloader (2BL) using the RC4 algorithm.
To understand the hash, you must first understand the file. The MCPX is a custom ASIC (Application-Specific Integrated
On Linux/macOS (Terminal):
While (d49c52...) is the most famous, there is also an MCPX 1.1 version. MCPX 1.1 Hash: 11d7947171e549da7747805d76204c38 512-byte "Hidden Boot ROM." <
You are most likely to encounter this exact string in three specific environments: