Param: value: 0 - 255,
Divided into high and low two parts, the lower 4 bits for LOAD behind 4 for special flag
LOW 4BIT: 0: normal startup the system disk firmware,
1: Start the the user disk upgrade firmware,
2: Direct start Loader USB (show only user disk)
3: start Loader USB (display system disk and user disk)
HIGH 4 bit:
0b0001: upgrade flag.
0b1000: User plate opening flag.