Comfort access allows raising of the roof from the fob, keyless start, keyless entry to the car etc. If you don't have it, you can't put the roof up without the fob unless you have it coded/smarttop installed. The only way you could, before the security update, was to use the physical key from inside the fob, in the door lock which would raise the roof back up even on non comfort access cars. But, as I say, that was before the security update which disabled this option.