How can I unblock my freeview box?

I downloaded update to my freebox box (Matsui/Astratec) yesterday morning and since then the box doesn't seem to be reading the remote control. The red light is permanently on (it doesn't flash when pointing and pressing the remote) on the front of the box and nothing is making it work. Have switched off, unplugged, changed batteries in remote etc. Any suggestions. My email address is jacqueline.carson@hbmsayers.com.