If you want to be finished by Oct, a photoperiod plant will not do.
An autoflower begins to flower when it reached a certain level of maturity (6 or 8 weeks), rather than a photo that required 12 hours of dark (sometime in Sept.)
Too hot, too much food, too much water. root damage, nutrient imbalance, lock out......
Damage is done:(, I'd remove most of the burnt curled up leaves & hope for the best.
Good luck