en: for English version
tc: for Tradition Chinese version
sc: for Simplfied Chinsed version

===== Update procedure ============
Step1: Copy OS image (*.bin) to PC.
Step2: Run EShell on PC.
Step3: Trun the rotary switch to the "3" position
and then restart the ViewPAC.
Step4: Use EShell to select the ViewPAC.
Step5: Use EShell to select the OS image.
Step6: Run the ViewPAC Utility and save the configuration.
Step7: Trun the rotary switch to the "0" position
and then restart the ViewPAC.
Done.

For more details, please refer to the user manual.