this thing is already SEVEN years old. And what does refurbished mean, any HDD is nearly dead after such a long running time.
Updates didn't work for me. Every point release meant a complete reinstall.
No it’s not a late 2012, defo can’t be updated anymore unfortunately
Yours should support Mojave just fine if it’s a “Late 2012” model. It’s on Apple’s supported hardware list. The bigger question is why would you want to upgrade to Mojave? For me Mojave (and its default APFS format for SSDs) is a pain, especially as DiskWarrior can’t currently repair APFS volumes. People often think latest is best but this isn’t always the case, particularly with regard to older hardware, and if your setup works for you right now my advice is don’t update simply for the sake of it.