Can you summarize the main points about the glory of Udi as presented in Chapter 33 of Sai Satcharita?

Chapter 33 of the Shri Sai Satcharita is dedicated to explaining the glory of Udi. The chapter outlines both the practical and philosophical aspects. Practically, it was created from firewood burned in Baba's Dhuni and was distributed to all devotees, especially as a sign of permission to leave Shirdi. Philosophically, the Udi carried a profound message. It symbolized that the entire universe and the human body are transient and will ultimately turn to ash. As the chapter states, Baba used the Udi to remind people of this impermanence and to convey the ultimate truth that 'Brahman alone is real' while the cosmos is pervaded by Maya, or illusion.