![]() If the installer asks to unlock your disk, enter the password that you use to log in to your Mac.Click Continue, then follow the onscreen instructions. ![]() Reinstalling macOS won’t remove your personal data. Ensure you have a full backup of your OS before installing / upgrading, using Time Machine to an external drive.When you see a window with the option to reinstall macOS, this means your Mac has started up from Recovery.Install the new OS to a separate partition, so there is always a roll-back or escape lane should (god forbid) anything go awry).One suggestion I would make (as with all upgrades) is one of two routes prior to any upgrades: During or immediately after the migration, the file above should be removed, so the migration will live happily on the unsupported hardware. There is a small gotcha to this, is that you need to install Lion to a supported platform first (such as a Core 2 Duo), then migrate that installation to the unsupported platform. It seems that the only thing preventing a Lion installation on a 32-bit platform is a hidden (from the system, or available through Terminal) file that can be removed: Now, not being one to give up on these things lightly, a little investigation reveals a simple method of getting the installer to run and upgrade this hardware. As soon as these are removed (from Software Update and the like), then the solution will falter. This solution works, as long as binaries included with the OS include 32-bit. The discussion here is actually about supporting 32-bit vs.
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