Apple is clearly happy for Big Sur to run on a machine of this age and as long as there are no underlying hardware faults there's no reason to expect any more software problems on this computer than on any other. When you've reached or passed 10.13 (High Sierra) you can clone the contents of that SSD to the larger one (there are many ways of doing this) or simply start again with a clean installation of Big Sur on the 256GB drive (which should then be recognized and work normally because of the EFI firmware update installed as part of the 10.13 upgrade).Ĭlick to expand.I think "nightmare" might be going a bit far.
Once this has been done it should be relatively easy to download and upgrade to later versions of macOS using the 128GB SSD. It rather cleverly recommends downloading the Mozilla CA Certificate Store from which neatly avoids having to wrestle with the Apple site while still providing a reasonably well-known and trusted source.
There's a solution here on Stack Exchange (scroll down to the highest scoring answer, but ignore the first two steps as you're going to have to download the new certificates anyway) explaining in considerable detail how to install a full set of current root certificates on older versions of macOS.
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