I’m now installing Jaguar 6C106 on my iBook, where I’ll be using it as the default OS. I don’t have a second drive in my iBook as I do in my G4, so I can’t go back to 10.1.5 now.
I’m not worried about losing data on my iBook since I keep all of my work synchronized between my iBook and my G4. I won’t lose anything even if I have to erase the disk to install the final version of 10.2.