Windows 10 Mobile
I had two Windows 8 phones that I hadn’t update to Windows 10 yet. With the closure of the Windows 8 store, that was no longer possible with the upgrade-app. And the Recovery Tool only has Windows 8 images… Fortunately, Microsoft has another tool, that can put Windows 10 on any phone that supports it. It gets you an old image, so expect a few upgrade cycles afterwards, but at least it works, and at least the Windows 10 Mobile store is still open, so you can get some of the few apps on there if you wish.