Option (a): You can use the following NComputing URL which contains the SDA Linux kernel update script to manually update the device:
In this case, go to your RX-HDX device (NoTouch OS), open the Configuration UI, go to ‘All > Extension’ and enter the above NComputing URL as the value for the ‘User-defined module URL’ parameter:
Option (b): You can download the script from the NComputing URL above, and then put this script into your own web server accessible via HTTP protocol. No Touch Center appliance can be used for that purpose. You will then provide your own HTTP URL (instead of the NComputing URL) to the ‘User-defined module URL’ parameter as shown above.
Note: Rather than manually typing the HTTP URL on the RX-HDX device, it may be easier to remotely connect to RX-HDX via your web browser (on a PC or laptop) by simply pointing your web browser to the IP address of the device. Then you can simply copy the above URL from your PC/laptop and paste to the User-defined module URL parameter of RX-HDX via the web browser. Please refer to this KB for remote web browser access to the RX-HDX device.