The correct command sequence is:
Code: [Select]
> " /" select-dev
> 00000008 " graphic-options" get-my-property 2drop !
> unselect
> mac-boot
i.e. on the first line the select-dev must come as the last word on the line. The error on the second command comes from the fact that the root of the device tree isn't properly selected. Apparently it is also better to release the device node (line 3). "mac-boot" then boots MacOS . Source: http://www.rutemoeller.com/mp/ibook/ibook_e.html