Ti segnalo questo programma, le sue spiegazioni e le FAQ giů in fondo. NB: non hai precisato il modello di Mac!
http://www.ahatfullofsky.comuv.com/E...s/SMS/SMS.html
Q: I tried your program and I tried holding the 6 and the 4 key on startup but it still says that the kernel is running in 32-bit mode. How can I start the kernel in 64-bit mode?
A: You can’t. Not unless you hack the EFI which is a bad idea. As explained above Apple currently does not support booting into a 64-bit kernel on a range of Macs - and for very good reasons. Apple might deliver a firmware upgrade when third party apps had enough time to rewrite their kernel extensions as 64-bit kernel extensions. The officially supported Macs are shown in the list above, though there are some more Macs which can boot into the 64-bit kernel and which are not on the list (like the MacBookPro5,5).
Q: My Mac is one of the supported machines but I still can’t start the kernel in 64-bit mode.
A: Even if you computer is fully capable to boot in 64 bit but you have an EFI PASSWORD set, pressing 6 and 4 at the boot will not work
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