Download the new SX firmware stored as UpgradePack from Raritan support website to an FTP server (for example, a FileZilla server), assuming that FTP server has an IP address of 192.168.51.204.
Extract the zip file to a folder under FTP root directory, for example:
\home\downloads\firmware\UpgradePack_2.5.6_3.1.0.5.2\Pack1of1. Make sure the folder is accessible by an FTP user account that you have.
Log in to the SX through a web browser. Choose Maintenance > Firmware Upgrade. Enter FTP server IP address (for example, 192.168.51.204), FTP username and password, and the FTP folder path where the extracted files are stored (in this example:
/UpgradePack_2.5.6_3.1.0.5.2\Pack1of1), and click Upgrade.
After firmware upgrade is completed, log in to SX and check the firmware version again from: Maintenance > Firmware Version. You can also check firmware upgrade history to make sure: Maintenance > Firmware Upgrade History.