What was the final outcome of Dev's misunderstanding? How did he react after learning the truth from Jog?

The misunderstanding was resolved when Jog sent a detailed letter to Dev explaining how Sai Baba had kept His promise. According to Chapter 40, upon reading Jog's letter which relayed Baba's own words, Dev had a profound realization. The text states his eyes "overflowed with a surge of love." He immediately felt deep regret and shame for his lack of faith, exclaiming, "Shame, shame! I blamed Sai in vain!" The story concludes with Dev feeling very dejected in his mind, not out of disappointment anymore, but out of remorse for having failed to recognize his Guru and for unjustly blaming Him. This emotional turnaround signifies the resolution of his doubt and a deepening of his faith.