If users want to update the OS image of I-7243D, please follow the steps below.

1. Power off the I-7243D.
2. Wire the Pin *Init and Pin GND of I-7243D.
3. Connect the PC available COM port with the COM1 
   of I-7243D by using the three-line RS-232 
   cable. Users can see this black cable in the 
   product box.
4. Power On the I-7243D.
5. Modify the first line of 7188xw.ini file as follows if users use the PC COM1.
    
   C1 B115200 P0 D8 S1

   Or if users use the PC COM2, the first line of 7188xw.ini will shown below.

   C2 B115200 P0 D8 S1
6. Un-zip&Copy the OS image file and 7188xw.F4 file from UDP_Version folder or Normal_Version folder
   into OS-Image folder. Therefore, you will see the fore files, 7188xw.exe,
   7188xw.ini, OS image file and 7188xw.F4 in the same folder.
7. Double click the 7188XW.exe, and press Enter key. If any hint is shown, it 
   is successful that your PC connect to the the I-7243D.
8. Press F4 key, then the 7188XW.exe will update the OS image automatically.