We are in the middle of installing new Citrix NetScaler for load balancing purposes. We ran into some issues with the box. It was decided that we need to update the firmware. It is simple and straight forward.
First, download the firmware. It would be done from the My Citrix web page.
Second, transfer the firmware into /var/install using any SCP server, i have used WinSCP.
Third, telnet into CLI. type the following
tar -xvzf build_x_xx.tgz
It will promot to reload, press Y. and wolla, you are done.