This usually signifies a size mismatch. Ensure your MCPX file is exactly 512 bytes. If it is 256KB or 1MB, you have accidentally loaded a standard BIOS file into the MCPX slot.
196a5f59a13382c185636e691d6c323d (usually indicates a dump that is off by a few bytes). Mcpx Boot Rom Image For Xemu
Because the MCPX Boot ROM is proprietary code written by Microsoft and Nvidia, it is protected under strict copyright laws. This usually signifies a size mismatch
Because the ROM is only 512 bytes, the code is incredibly dense and optimized. Its primary functions are: Mcpx Boot Rom Image For Xemu