![]() Use USB installer to install High Sierra.ĩ. Use USB installer Disk Utility to format SSD.Ĩ. Make USB bootable installer of High Sierra on flash drive, with the appropriate version that supports your unsupported 2009 MBP.ĥ. Backup your most important data somewhere else too.Ĥ. Just don't erase the HD before you remove it.ģ. The good news about installing an SSD is that once you remove the HD, you automatically have a backup already. And yes, it's always best to have MULTIPLE backups before any such process. Personally I would recommend a clean install anyway, but that would require you re-installing all your downloaded software. ![]() Is it even possible to do an in-place upgrade from El Capitan to High Sierra on an unsupported machine? I'm not sure. High Sierra + 8 GB + hard drive = painful High Sierra + 4 GB + hard drive = painful SSD is mandatory though, even more so than memory. Sierra offers no advantages over High Sierra, not even performance.
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