Updates for V1.6.9
1.   Correct spelling mistake 
2.   Correct bug for wrong max temperature range.
3.   Fix the problem of incorrect configuration parameters
Steps for updating the software:
1. Take out your microSD card(max 32G).
2. Drag the downloaded software under the root directory of your microSD card.
3. Insert the card into the console -  power off the console - power on the console - update the program.
HP3500 Firmware v1.6.9