how to reload a quest ?

right so I'm kinda desperate, but I did every quest on my save, and I want to do the main quest from PL again, from the "Firestarter" mission. The thing is I can't reset the mission (setting the value from 1 to 0 does nothing), and the baseID for the missions after Firestarter does not show in the editor. Anyone know how to deal with it pleeeeeeeaaaaaaaaaase ? (sorry for bad english)