For what it’s worth, on the host side of things the MfgTool program mostly uses the standard windows error codes which you can look up fairly easily. Google “Windows System Error Codes (0-499)”. You will find 1, ERROR_INVALID_FUNCTION, Incorrect function.
I grepped the host source and could not find a place where we are actually returning that code, but we could be passing it back as an error code from one of Windows API’s that are called.
Like Frank said, We really need the host log and the serial debug output to be able to zero in on the cause.
Best regards,
Chris