Boot loader update sequence

1. Attempt to detect the USB mass storage device with a FAT32 file system.

2. Verify whether the boot-loader update image name is correct or not.

3. Verify the integrity of the boot-loader update image.

4. Attempt to perform a boot-loader update if the correctly named boot-load update image is located on the USB mass storage device.

5. Write, read an erase the protected region on Flash memory.