@Younghee Son,
Did USB just stop working or did you make changes in BIOS setup first?
How did you try to update BIOS and what errors, if any, did you get?
What OS, if any, is booting on your tablet?
Do you know what version of BIOS you currently have on the tablet?
Please verify your serial number, I can’t seem to locate it.
Do you have the 32GB or 64GB version of the Vi10?