Here is an Installation Guide about OKPOS J1900 / Windows 10  Model and Bios F/W UPDATE by size of the Monitor. 

 
 - Model : 1) Optimus, OK-K1(KIOSK)
              2) ZED5 / I-POS / K-POS / Z-POS (15 inch)
              3) ZED7 (17inch)
              4) W-POS (W-156), W-POS (W-185)

※ How to Install?
   1. Check the below table that indicated by Model then download the attachment File..
   2. Then please check the attachment file "J1900_Win10_BIOS_Update_guide.pdf"
     - Caution -
      Extract on C:\ path of the download file. 
      Avoid put any Korean Words on the path of the Bios Update folder. (For the smooth process of the BIOS Update.)