Version 2.5 can not be downloaded it can only be installed froma re-image CD.
If you do not have a 2.5 CD, but you do have a 3.0 CD then you can re-image the sensor to 3.0. Then download the 3.0(1)S4 executable from CCO. And use it to uninstall 3.0 which takes you back to 2.5.
NOTE: The 3.0 CD installs the 2.5 image and then upgrades it to 3.0, so by uninstalling 3.0 you are back to 2.5.
3.0 can be istalled as a re-image from the CD or as an upgrade to an existing 2.5 sensor.
You can not upgrade to 2.5 or 3.0 from 2.2.1 without a re-image from CD.
marco
