Before updating new Foxwell NT644 Holden software ，you should make these:
1. Make sure if there ia any update for holden listed in the updates table, if not, please check your installed software and ensure that the Holden software has updated to the latest version.
2. Give us the serial number of your NT644 Scanner, we can check if the holden software NT644 has updated or not.
And then , you can install the latest software as following the below steps:
1. Eject the tools SD card
remove the rubber flap from the right side of the tool, Push in the SD card to eject it.
2. Remove all other USB devices form your computer and Insert the SD card into your computer, or SD card reader.
3. Close down the windows dialog boxes that appear.
4. Double click on the downloaded update executable file.
5. Select “run” from the windows dialog box that appears.
6. Select “Update” from the right
NOTE : DO NOT SELECT FORMAT
7. Click “Exit”
8. Click on “safely remove hardware” from your windows tray, remove the SD card from your computer, and install it into your Foxwell Scan tool.
Please get in touch via our contact page, should you have any difficulty.
Our contact page: http://www.foxwelltool.com/info/contact-us/