Solution:

If user plug SumDisk flash disk in MIC-2130 and would like to boot from MIC-2130 directly, sometimes it may be failed. The way to improve this situation is shown as follows: Pin-39 (CN3) <==> 4.7K ohms <==> Pin-41 (CN3) That means you'd better add 4.7K ohms between Pin-39 and Pin-41 of IDE connector (CN3)