After downloading the PacketShaper 11.x software and following the procedure to load the file and reboot, the unit came back to the old version of software.
You should confirm that the image has actually loaded before rebooting the unit. Sometimes this takes a couple of minutes after issuing the setup images add command. If the image hasn't loaded completely, and the user reboots the image, the upgrade will fail and the unit will load the previous version.
Follow the instructions below to verify image has been successfully added before rebooting.
Follow these instructions to load the image and reboot the unit.