Configuration
    - Open config.ini
    - Modify [serial] section's "port" parameter

Run
    - In DOS mode, enter into the program's folder
    - Run uboot_upgrade.exe
    ex:
        C:\ECS4120_uboot_upgrade_v2.1.0>uboot_upgrade.exe
    - Turn on the power for switch 

NOTICE:
    - If DUT's uboot version is not v0.0.4.0, then upgrade procedure will fail
    - DO NOT modify [product] section's "type" parameter, [source version] 
       section's "src" parameter and [destination file name] section's "dst" parameter