you can do that using CLI
it is straight forward , just copy the software image to the sensor then write the command :
root#sh os-file-name.sh
( it will take time & you will se messages displaying the status )
but since you didn't make the upgrade from the NSM , you should readd the idp to the nsm after thew upgrade
there is a problem you'll face , but i don't know how to solve it :
when readding the idp , you'll need to do all the configuration from the beginig , i on't know how to take a copy from idp conf