The time travel worked, but not in the way you anticipated. Instead of sending your whole body back in time, the iTime has implanted your consciousness into the mind of Steve Jobs. You are now Steve Jobs.
For the next 30 years, you try to reenact Jobs’ life as best you could from what little you remember from his Wikipedia entry. The Lisa was called Liza, and the Newton (after being properly tweaked) became a massive success, and spawned the NewtonPod, NewtonPhone and NewtonBook. You, of course, kept up his trademark shouting at employees and boinking of celebrities in the 1980s.
How time flies when you’re having fun.